It was revealed that the submarine's sonar operator had admitted that his work had been hindered by the civilians that had been on board the vessel.

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Chief Petty Officer Andy Horsburgh, whose job is utilising the submarine's sophisticated sonar, says that when at sea other submarines need to worry because "we'll find them before they find us".

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The effect of project delays was underlined this week in a report from the National Audit Office which revealed that the first three new Type 45 destroyers will enter service without sonar defences to protect them against submarine attack.

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Several Coast Guard cutters, the Honduran Navy and FBI dive teams then used side-sonar equipment to search for the sunken submarine-like vessel, which was located on July 26.

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