Answers in a fishtail

In our previous posts (27 April, 05 May and 12 June), we have discussed the matter of the inner covers to the offal chute on the Gaul and provided photographic evidence from the wreck which showed that these covers had in fact been secured in the closed position prior to the loss of the vessel and that they could have been opened by the forces of the sea before sinking took place.

The 2004 RFI panel thought, however, that the offal chute inner covers – found open on the wreck – had been negligently left so by the crew. (The same explanation was employed in respect of the duff chute inner covers, which had also been found open.) (See also this POST)

It must be mentioned here that the regime on the Gaul was such that the operation of offal chute would have fallen under the jurisdiction of the factory manager and his team, while the operation of the duff chute was under the control of the deck crew.

This arrangement gave the RFI experts the opportunity to claim that the factory deck staff, as non-fishermen, had been ignorant about the importance of keeping the offal chute inner covers closed when not in use and, tragically, had failed to secure them at the end of a busy working day.

Unfortunately, the RFI also failed to draw any conclusions from the relevant information that was available to the inquiry. This information relates to the following facts:

1. The offal chute overboard discharge acted as a relief valve during the fish processing operations and, as such, it would only be used when the fish meal plant (rate = 25 tonnes/day) was operating at full capacity or when the fish meal hold was full (capacity = 120 tonnes)

It is also known that the Gaul skipper’s reports recorded that at the time of the loss, the vessel had only managed to accumulate about 20 tonnes of fish fillets onboard together with about 7 tonnes of fish-meal (i.e. a poor catch for the period she was fishing).
The logical conclusion that follows from these data is that there would have been no need for the factory crew to use the offal chute overboard discharge during the vessel’s last voyage.

2. Furthermore two witnesses (Messrs George Petty and Raymond Smith) testified at the hearings that the offal chute would not have been used during the last two voyages in the Gaul’s short life, simply because the fish meal hold was never filled.

More explanations, quotes and details on the subject have been published at this LINK and HERE (diagram).

Like the rest of the conclusions in the 2004 RFI report, the assumption of negligence by all parts of the crew, no matter how implausible, were forced into relevance and given the status of fact.

Photographic evidence

In our posts of 27 April and 05 May we provided photgraphic evidence from the 2002 underwater survey of the wreck of the Gaul showing damage to the closing arragement of the vessel's offal chute's inner covers. This evidence clearly contradicts the final conclusions of the 2004 Gaul RFI.
As previously advised, we are now presenting a video clip which contains further details on this subject, including a model of the offal chute's inner covers and their probable behaviour when subjected to seawater pressure.

Gaul - offal chute inner covers
Video sent by gadflymotion531

Continuation from previous post

The damage to the forked lug (securing clip) of the offal chute lid, which is visible in the image below, indicates that the crew of the Gaul (prior to the loss of the vessel) had secured the inner covers in the closed position. The covers were subsequently damaged when the sea burst them open.

In the above detail, the normal outline of the forked securing clip was drawn in orange

This evidence clearly negates three of the principal conclusions of the RFI:
1. That proper use of the inner covers would have prevented water ingress
This is incorrect - the above photo indicates that the covers had been used ‘properly’ but, unfortunately, this could not prevent the water ingress.
2. That, at the time of the loss, the inner covers were not closed and secured
This is incorrect – the evidence indicates that not only had the covers been closed and secured at the time of the loss, but also that the forces of the sea subsequently opened them.
3. That, at the time of the loss, there was no physical reason to prevent the crew from closing and securing these covers
The photo shows clearly that the securing arrangements were physically damaged and as such could not be used to secure the covers. It is most likely that this damage occurred ‘at the time of the loss’
Besides, the inner covers were in no way strong enough to be watertight. If they had been, they would not have been damaged.

More to come...

Another bent thing and more damning evidence

If the evidence we have published so far may have presented “an ostensibly compelling case”, to use Mr Jim Fitzpatrick’s expression from a recent letter, the evidence we will be publishing from now on should provide the Minister for Transport with extra certainty. As, in the same letter, he claimed that the information we presented did not constitute the whole picture – a claim with which, for probably different reasons, we agree - we have decided to show you more of that ‘picture’.
In previous posts we have already argued that the RFI assessment, that the inner lids of the duff and offal chutes on the Gaul had been left open by the crew prior to the loss of the vessel, was unsound. The condition of the closing devices of the duff chute indicates that its inner cover was, in fact, closed when the tragedy struck.

We can now reveal that the split covers of the offal chute were also closed. The images below, captured from the 2002 underwater survey film footage, illustrate that the bar attached to one of the offal split covers, as their means of closure, was found in its place and deformed in a way consistent with it having undergone strong pressure from the underside.

This finding, which the RFI panel was aware of, supports the proposition that the inner lids of the duff and offal chutes on the Gaul had initially been closed by the crew, but were burst open by the force of the incoming waves, at the time of the loss.


We have also constructed a model of the offal chute and tested it against the effects of water pressure acting on the underside of its inner lids. We used this model to replicate the damage to the securing bar, as observed in the images from the wreck of the Gaul. The photo below shows the result.

More to come...

Clues and toggles

In continuation of our post of March 09, we are now publishing a DOCUMENT, which points to some differences and similarities in the ways in which the re-opened formal investigations (RFIs) into two major marine accidents: the MV Derbyshire and FV Gaul have been conducted and the reasons why the first was able to deliver better quality results than the second.

We considered the formal investigation into the loss of the MV Derbyshire, in which, initially, the Assessors wrongly concluded - on the basis of a rope seen emerging from the Bosun’s store hatch opening and of a simple examination of the disposition of that hatch’s toggles - that the loss of the vessel had been due to crew error.

In a curiously similar manner, the Gaul RFI also put the blame for the loss of the trawler on the crew, who, the RFI panel claimed, had neglected to close the inner covers to two openings in the hull - this time on the basis of a ligature apparently holding the vessel’s duff chute inner lid in the open position.

However, as the Derbyshire Assessors’ report had been made public two years prior to the RFI court hearings, their findings were openly examined and contested when appropriate and this allowed the court to arrive, in the end, at a set of different and more robust conclusions.

What is worthy of note here is that, in the Derbyshire RFI, it was the subsequent examination by independent experts of the condition and position of the Bosun’s hatch cover’s toggles that led to the rebuttal of the Assessors’ initial verdict of crew error.

Finally, the court concluded that the crew had not failed to secure the hatch lid and that the rope emerging from the Bosun’s store hatch opening was nothing more than post-casualty debris.

Unfortunately, despite the precedent provided by the Derbyshire inquiry, during the Gaul inquiry no external, independent examination of the case was allowed.

In the Gaul Investigation, the report of the Assessors, the retained experts and the court was presented at the end of the RFI as one final document, ‘set in stone’. Nonetheless, a mere glance at the position of the toggles, as shown by the underwater survey footage, suggests that the inner lids of both chutes on the Gaul had been initially closed.

Surprisingly, during the court hearings, neither the strongback bar (which, in conjunction with two toggles, secured the offal chute cover) nor the condition of the toggles was even mentioned.
In addition to and more intriguingly than this oversight is, however, the creative, ‘non-figurative’ manner in which the retained experts produced the drawings of the duff and offal chutes, in their supposedly ‘as found’ condition.

The toggles, which in the underwater survey video footage are clearly shown to be in the ‘hatch closed’ position, appear on the experts’ drawings to be in the ‘hatch open’ position.

The unfortunate effect of these inaccuracies is that it can mislead subsequent examiners into concluding that, since all the toggles were found in the ‘open’ position on the wreck, the court’s finding that the crew had left the hatches open prior to the loss of the vessel is most likely correct.

More about it HERE

Closed Inner Covers

In our post of 18 February 2007 we discussed the conclusion of the 2004 Gaul RFI, which stated that the inner covers of the duff and offal chutes on the Gaul had been left open by the crew – an act of negligence that cost them their lives.
The only ‘evidence’ that the panel relied upon to back their deduction was hanging, literally, by a thread.

Moreover, we can now add, the underwater survey images show that there is a strong possibility that the inner covers had actually been closed and secured by the crew prior to the loss of the vessel.

The attached DOCUMENT explains in more detail how the state (i.e. position and damage) in which the fittings used to secure the inner covers closed (i.e. toggles and lugs) were found at the time of the underwater survey indicates that the covers could have burst open under the pressure of the seawater coming in through the open outer flaps.

Surprisingly, the RFI documents do not mention but once, and in passing, these closing arrangements that were, in effect, at the very centre of the problem area identified by the investigation.
More to come...

The rust

In our previous posts of 30 January 2007 and 9 April 2007 (incl. the ADDITIONAL DATA document) as well as our TECHNICAL REPORT etc., we explained in detail why it was unlikely that the non-return flaps of the duff and offal chutes on the Gaul should have both been seized in the open position, due to corrosion, at the time when the vessel was lost.
The hinge assemblies of the non-return flaps contained oilite low-maintenance bearings (oil impregnated sintered bronze), which were designed for the life of the vessel and not just for the 18 months period that was the lifespan of the Gaul.
Furthermore, the extracts from the underwater survey footage presented in our 30 January post showed clearly that, even after 28 years under the sea, other structures on the Gaul, which used the same combination of materials as the flaps’ hinges, worked without problem.

Now, we are adding the statements of two witnesses who had sailed on the Gaul on her previous voyages including the last but one.

Skipper Suddaby, whom we mentioned earlier on this site, tells us in his recently published book, at page 167 that: “I believe firmly that both chutes were in perfect working order right up to the time that the Gaul was lost” and that: “there is no report of the Gaul crew having trouble dumping the duffs back”.

Also, Mr. Petty, who had been the mate of the Gaul from 18 September 1973 to January 1974, when questioned under oath during the RFI, gave the following answers:

“Q. Can you remember using that hopper on the last trip you were on when you were with Mr. Suddaby?
A. What, the Gaul?
Q. Yes.
A. Yes.
Q. What was its condition at that time, can you remember? Was it working or was --
A. It was all working, yes, everything was working perfect.
Q. Did you ever have any problems with it or did the men have any problems where it seized up and so would not open when they threw duffs on it?
A. Never. That is the gospel truth, never.” (Transcripts of evidence, day 2 page 46)

The RFI conclusions, however, stated that the non-return flaps of the chutes were seized in the open position when the vessel left Hull on her last voyage (See RFI final report, page 286).If the chutes had been working perfectly well and smoothly during the Gaul’s first four voyages, as the witnesses testified, how could the RFI panel expect the public to believe that they were seized with corrosion when the vessel left Hull at the start of her fifth and last voyage? [1]

The RFI panel of experts and justice Steel should perhaps explain to us why they chose to flagrantly ignore all these facts and testimonies and go for the ‘rust theory’, in support of which they had no proper evidence.

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[1] The question of why two separate mechanisms, which had been appropriately engineered for the marine environment, which would have been fully greased and lubricated at the vessel’s delivery, which had different operating cycles and which were operated by two separate teams of ship personnel, should both seize in the fully open position due to corrosion and at approximately the same time, is rather intriguing.
As the RFI panel was informed during the investigation, it is far more likely that the non-return valves shared some fault in their DESIGN, which manifested itself during the severe weather conditions that the vessel encountered prior to its loss.

Laying the blame on those who cannot defend themselves

(click to enlarge)

The areas coloured in orange represent the critical down-flooding openings, which were deemed to have played a part in the loss of the Gaul.
The areas coloured in blue (the funnel vents) are also critical in the down-flooding scenario, although these are meant to be kept open at all times.

The duff and offal chutes were found open on the wreck. The 2004 RFI concluded therefore that they had been left open by the crew.
As we have attempted to demonstrate on these pages and in the attached documents, the chutes’ outer flaps had a design fault, while their inner covers could not provide sufficient protection against flooding.

The fish loading hatches and the net store hatch, as our previous post explained, could have been opened by air pressure or by the force of internal floodwater acting on them from inside the vessel.
The RFI panel’s opinion, however, was that these hatches, also, had been left unsecured by the crew and had opened due to gravity when the vessel was sinking.

The engine room escape door, the RFI surmised, had been opened by one of the crew when trying to escape from the lower deck at the time of the incident.
In the absence of any contrary evidence, the hypothesis that this door had been opened by air pressure is again more probable.

The RFI panel concluded that the access door to the accommodation space, also, had been left open by the crew; and we can contend again that trapped air pressure or internal floodwater pressure could have opened it just as well.

As to the factory deck access door the RFI concluded, this time on the basis of some tangible evidence, that the crew had failed to secure it in the closed position.

All in all, the only conclusion we can draw from the dubious RFI findings is that the 2004 investigation panel was too eager to suggest a pattern of widespread crew negligence and to lay the blame for the loss of the Gaul on the victims to bother about plausibility.
Ignoring the existence of alternative explanations, underpinned by simple scientific principles, the RFI panel chose to put forward a loss scenario that was not only unsupported by any credible evidence, but also defied common sense.

Archimedes, Boyle and Newton - expert witnesses in the Gaul Investigation

The 2004 Gaul RFI concluded that:

- The design of the duff and offal chutes on the Gaul was satisfactory to prevent the ingress of seawater onto the factory deck. (RFI final report, page 285)

- At the time of the loss, there was no physical reason why the watertight covers could not have been closed and secured. (RFI final report, page 286)

Additionally, it was assumed that, apart from leaving open the closures of the duff and offal chutes, the crew on the Gaul had also left unsecured a number of other important weathertight hatches and doors – all during a major storm. (!!!)
(This ‘everything was left open’ assumption was possibly meant to reinforce the RFI panel’s theory of crew negligence: i.e. if the trawlermen had left so many things unsecured, leaving the chutes open would be less surprising – just part of the general pattern.)

But why would the 36 experienced crewmembers do such reckless things? Save for the unlikely possibility that they all ran amok that day, what explanation could there be for such weird behaviour?
Yet, the 2004 Investigation panel decided that the crew had ignored all those protections to the safety of their ship and of their own lives.
No scientific explanation was found, although simple scientific explanations do exist - if you are willing to look for them.

In support of these alternative explanations, we are able to present the evidence given by our expert witnesses: Sir Isaac Newton, Messrs Archimedes of Syracuse and Robert Boyle.
The physical laws established by these honourable gentlemen could be used to prove the existence of alternative loss scenarios. We have already done this for the closing arrangements on the duff and offal chutes on the Gaul, which, we demonstrated, could have easily been opened by the forces of the sea. Bearing in mind that these laws govern cause and effect, it can be similarly demonstrated that a number of other important hatches and doors on the Gaul could have been burst open by the maelstrom of forces unleashed on them as floodwater surged from compartment to compartment, while the vessel was sinking in heavy seas. (More about this will be said in a separate post)

However, once one accepts that other plausible explanations exist, the general crew-negligence scenario, that the 2004 RFI panel seem to have stapled themselves to, becomes increasingly doubtful. To say the least...

Yet another flaw in the design

So far, we have revealed that there were two design faults and one, what we would call, error in the in the design of the duff and offal chutes on the Gaul:

The principal design fault (for details, see this LINKED DOCUMENT and this VIDEO CLIP), related to the construction and arrangement of the chutes, meant that the non-return flaps in the duff and offal chutes on the vessel could have been opened by the action of the sea
The second design fault showed the possibility for the bolted assemblies of the non-return flaps to become twisted due to the force of the sea, and remain open thereafter (further details can be found at this LINK).

The design error described in our post of 26 June 2007 was a dimensioning mistake in the shipyard’s construction drawing which, in certain circumstances, could have caused the flap to jam in the open position, after having been opened under the action of the sea. (For further explanations please follow this LINK)

Now, we are presenting yet another design error (explained HERE): a miscalculation of the relative weights of the components of the chutes’ non return flaps, the consequence of which meant that a wave load of only 7.5 kg could have been enough to force them open.

It should be noted that the design of ‘non-return flaps’ within the duff and offal chutes should have enabled them to withstand the forces of the sea, close automatically and prevent water ingress. However, as a result of the inadequacies listed above, the action of the sea could have caused the flaps to fail in their main functions.

Thus, it is evident that the design of the Gaul’s chutes was vitiated by multiple flaws (and, we warn you, there is more to come) and that the unfortunate nature of these flaws was such that they augmented each other’s effects, rendering the vessel unacceptably vulnerable to flooding and capsizing.

Another mechanical reason

"18.17... it is important to note that although both chutes were found on the wreck to be open both in way of the non-return flap and the internal top cover, there is no known mechanical reason why this was so." (Report of the 2004 Re-opened Formal Investigation into the Loss of the FV Gaul)

In the paper describing the MAIN DESIGN FAULT on the Gaul, we gave an account of how the closed flaps of the duff and offal chutes on the vessel could have been forced open by the sea at the time of the incident. (You can also see a model of the design fault captured on this VIDEO clip).

Furthermore, the factor tree analysis diagram, published earlier on THIS PAGE, presented a range of alternative explanations, as to how the outer flaps of the duff and offal chutes on the Gaul could have become open and remained in the open position (the RFI having only examined and accepted that the flaps were open, prior to the vessel’s departure from Hull, as a result of corrosion and lack of maintenance).

One of these alternative explanations (i.e. THE SECOND DESIGN FAULT), mentioned in an earlier POST, put forward the possibility that the bolted non-return flap assemblies within the chutes could have become twisted due to wave action and remained open as a result.

Today, we are presenting another alternative explanation, whereby a simple dimensioning error in the shipyard’s construction drawings meant that, if ever the brass gland within the flap hinges was loosened by the operation of the flap, parts of it could have bound together, thus causing the flap to remain seized in the open position.

THIS PAPER gives the details.

Moving the goalposts

In our first POST, dated 31 August 2006 and in the technical paper (pages 15, 26-30) published HERE, we showed how the internationally agreed definitions for ‘watertight’ and ‘weathertight’ (which lay down the required properties for certain ship’s fittings) had been altered in the final report of the 2004 Gaul RFI, by the Investigation panel, in a way that made them looser in requirements and application.

To recap, the RFI definition for ‘watertight’ did not contain the very specific and essential capability of “preventing the passage of water in any direction under a head of water for which the surrounding structure is designed” that the standard definition incorporated, while the definition for ‘weathertight’ replaced the statutory capability that “in any sea conditions water will not penetrate into the vessel” with the less stringent requirement of ”being sealed to exclude water in normal sea conditions”.

Now, you may wonder: why would the RFI panel do such a thing, of creatively re-writing these definitions, rather than simply reproducing the standard ones from the Load Line and other Conventions?

If one looks at this problem in the whole context of the investigation and its outcome, then it becomes apparent that, without these alterations, the findings and the loss scenario that were produced by the investigation panel, would not have held water.

It was only according to these modified definitions that the inner covers of the duff and offal chutes on the Gaul could be categorised as watertight (in reality, these covers were not even of weathertight standard[1]).

Once having wrongly ascribed ‘watertight’ properties to the inner covers, it was then easy to claim, as the 2004 RFI did, that, had these covers been secured in the closed position, the flooding and subsequent loss of the vessel could have been prevented. As the Gaul’s inner covers were found to be open during the underwater survey, the blame for the incident was then immediately placed on the crew, thus avoiding any need for a further proper examination of the faulty outer ‘non-return’ flaps. (See VIDEO clip for a brief demonstration of the design fault)

Hence, we can only infer that: had the RFI panel not assigned properties to the closing arrangements on the duff and offal chutes of the Gaul on the basis of false criteria, they would have had to arrive at the same conclusion as others have: i.e. with the outer non-return flaps properly designed, the vessel would not have sank, regardless of whether the inner covers were open or closed.

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[1] Only in combination with the outer flaps were the inner covers intended to form a weathertight barrier to the sea. The role of the outer flaps was to provide a strength barrier against the force of the waves, and that of the inner covers to simply prevent the leakage.

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Compliance with the rules (Part II)

In our previous post we indicated several non-compliances with the safety rules pertaining to the construction of the Gaul’s duff and offal chutes.

We are now reporting on further non-compliances with the rules, details of which have been published within this LINKED DOCUMENT.

More about the main design fault on the Gaul

In an earlier posting we gave details of the main design fault that was present in the closing arrangements for the duff and offal chute openings on the Gaul (i.e. that that non-return flap plates opened the wrong way). In that posting we suggested that, if for any reason the flap valve was not fully closed, it could be opened by the action of the sea.

In fact, those comments did not reveal the full extent of the problem; the design of the flap valve was such that even if the valve had been in the fully closed position, the forces of the sea could have opened it.

Furthermore, this is not a just a hypothetical scenario, the partial print from one of the Gaul’s drawings (below), shows that there was a lip or ‘free edge’ at the end of the flap for the sea to act on.

And the VIDEO CLIP in our previous post shows in graphic detail just how easy it would have been for this “non-return” flap valve to open and for the seawater to flood into the factory deck of the vessel.

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If the above link does not work, please try HERE

Back garden model testing

At the end of the 2004 RFI, the wreck commissioner opined: “[…] it is important to note that although both chutes were found on the wreck to be open both in way of the non-return flap and the internal top cover, there is no known mechanical reason why this was so.” [1]

This viewpoint has recently been echoed by the the Treasury Solicitor who said: “there was no evidence that the chutes had been forced open by wave or water action so this was not advanced as a loss scenario by the experts”

Having enjoyed the benefits of a sunny weekend, we decided to construct a small-scale (and cheap) model of the chutes and test them with a hose. The results of this simple experiment provide a clear illustration of the SCENARIO whereby the design fault in the duff and offal chutes on the Gaul caused the flooding and loss of the vessel.

Simple mechanics!

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[1] Report of the Re-opened Formal Investigation into the Loss of the FV Gaul

Back garden modelling of the Gaul chutes
Uploaded by gadflymotion531

The video file can be dowloaded from this SITE (2.9 Mb)

A few essential details that went missing

In any major and costly marine accident investigation, such as the Gaul RFI, one would normally expect lots of data and information relevant to the identified cause of the tragedy to emerge and be made available.
Yet, looking at the government website: www.fv-gaul.org.uk, the sole repository of official information on the Gaul case, one cannot help wondering why so little was published about those things that were pertinent and central to the loss of the vessel, while many tangential issues were generously treated.
Anyway, to make up for the government’s oversight, we have taken it upon ourselves to publish some ADDITIONAL DATA from the vessel’s design plans together with a few detail views of the duff and offal chutes on the Gaul.
These diagrams, apart from adding clarity to the general arrangements on the Gaul and the construction of its chutes, also show that the RFI panel’s claim, that maintenance of the Gaul’s flap assemblies was not possible, is clearly not correct. [This latter aspect has, in fact, already been covered in the full TECHNICAL REPORT.]

Cherry-picking

After a suitable delay, Laurance O’Dea, the Treasury Solicitor, emailed a reply to our oft-repeated enquiry regarding the missing evidence in the Gaul investigation.

In his response, dated 23.02.2007, Mr O’Dea again sought to dispel our concerns about the soundness of the investigation, this time by assuring us that the retained experts in the RFI “were able to consider the various drawings of the vessel, including the arrangements of the duff and offal chutes before the public hearings”, that “these experts had been instructed to make their own judgments on the evidence that they were able to see” and that they were “independent and reached conclusions on the evidence available to them”.

Fair enough, so far, but what we actually wanted to know, though, was whether the evidence available to those experts included any mention of the design fault that the specialists from MCA and MAIB had discussed and agreed upon some time ago. Was this evidence contained in the bundle that ‘they were able to see’? We still haven’t got an answer to this question.

“The evidence presented to the Inquiry, and accepted by the Wreck Commissioner was that the chutes were not secured and that water was able to find its way onto the factory deck” and “there was very strong evidence from the survey that the chutes were open and not secured at the time of the loss” the missive further explains.

Up to this point, we agree with the Treasury Solicitor. But then he goes on to say that “there was no evidence[1] that the chutes had been forced open by wave or water action so this was not advanced as a loss scenario by the experts”

Pardon? But, we have already demonstrated that there was enough evidence, which, in legal terms, is called ‘scientific evidence’ – i.e. deduced from well-recognized scientific principles –that supported this loss scenario.

The fact that the chutes were found open at the time of the underwater survey means just that. It does not tell us when or how they had become open. And it certainly does not reveal that they had been open for some time before the incident[2]

To assume otherwise is simply jumping to conclusions.

We don’t know how the retained experts made their judgements; we fear, however, that the evidence that was placed before them was selected in a way that rather ‘counted the hits and overlooked the misses’.
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[1] We would also like to point out that there was no concrete evidence to back the RFI’s conclusion that the non-return flaps had seized in the open position due to corrosion. In our post of January 30, we also showed that, in fact, there was evidence to the contrary.
(Note: the RFI relied heavily on the testimony of a former DOT surveyor who had carried out a survey on an older Gaul sister vessel. He had found that the flaps on that vessel were open and stated that they were rustbound and frozen. Had he been questioned further on this issue, the court would have learned that, whilst the flaps may have been found to be open, it was only an assumption on his part that this had been due to corrosion. The hinges that were assumed to have corroded were not in fact visible to the naked eye and, in order to establish whether corrosion had occurred or not, it would have been necessary to dismantle the flap assemblies).

[2] For further details on these issues you can revisit our previous posts and the factor tree diagram.

Loose ends

In the his opening speech to the Gaul Re-opened Formal Investigation, Nigel Meeson QC, representing the Attorney General, advised on one of the matters on which the RFI should focus:

“…the duff chute …This time a single flap lid, which we can see, is in the open position. It is difficult to see, but if one looks carefully you can see that the chute here is kept in the open position by a wire pinned across the top left-hand corner, which I am indicating now with the laser pen.”
This matter was to become one of the RFI’s principal justifications for concluding that the inner covers of the duff and offal chutes on the Gaul had been secured open by the crew, a fact that was subsequently deemed to have contributed to the loss of the vessel. [1]

The image, taken during the 2002 underwater survey, that Mr Meeson referred to, purportedly shows a wire going across the inner lid.

We have also viewed this picture, as well as the rest of the video footage, and have come to a different conclusion, which we now present in this DOCUMENT.

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[1] The RFI also found that the fact that the outer flaps were found open had been due to corrosion and lack of maintenance. Please see our earlier posts on this issue.

Another small observation

The 2004 Formal Investigation into the sinking of the FV Gaul concluded, as we all know by now, that the cause for the loss of the vessel was the ingress of a large quantity of seawater through the two duff and offal chutes openings in the hull of the vessel.
The double-barrier protections of these openings – the inner covers and the outer flaps - were found to be in the open position during the underwater survey in 2002.
The fact that the outer flaps were found open, the investigation concluded, was due to seizure caused by corrosion in the vessel’s 16 month old flap hinges and failure on the part of the crew and shore maintenance staff to identify and rectify this problem.
The fact that the inner covers were also found open was explained away by crew negligence. However, the trouble with these findings (as we have attempted to explain in our earlier posts) is that they were based on unsubstantiated assumptions.

Let’s take, this time, the presumed corrosion at the flap hinges. (For a few more details on this issue please click HERE.)
As the same combination of materials, mild steel and brass, had been used in a number of other structures on the Gaul (e.g. for the toggles and clips on all weathertight hatches and doors), one would expect similar corrosion problems in those areas.
In reality, though, this doesn’t seem to be the case.
Quite the reverse, as the following clips[1] show, even after 28 years under the sea, the toggles and clips on the Gaul did not present such a level of corrosion and seizure that would prevent them from being easily unscrewed by the ROV[2] arm.

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[1] Extracts from the 2002 MAIB video footage - © Crown copyright
[2] Remote Operated Vehicle

weathertight hatch mild-steel clips & brass bush

weathertight hatch brass toggle & steel toggle bolt


weathertight hatch brass toggle & steel toggle bolt

Another design fault

In our previous post we provided a LINK to a factor tree diagram, which presented the various alternative explanations as to why the outer non-return flaps in the duff and offal chutes were found in the open position during the 2002 underwater survey on the Gaul.

We have also published a simple pictorial explanation of the PRIMARY DESIGN FAULT in the vessel's chutes.

Now we are publishing a document, which reveals a second design fault in the construction of these chutes (please click SECOND DESIGN FAULT to view it).

This additional design fault, demonstrated in the above-mentioned paper, gives weight to the possibility that the bolted flap assemblies within the duff and offal chutes became twisted due to wave loading and remained open thereafter. (See item (14) on the factor tree diagram).

Are the conclusions arrived at by the Gaul investigation panel (i.e. that the vessel’s chutes had been left open by the crew and shore staff for 59 days before the accident occurred) supported by any credible proof?

We would be interested to hear it.