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While sailing off the coast of Great Yarmouth on 14 August 1915, Gunner Jehan received news that a merchant ship, the Bona Fide, of 59 tons, had been stopped by the German submarine UB-4 and subsequently scuttled with explosives by a boarding party.
A boarding party of British SBS men reached the target via a Sea King Mk.4 of 846 Naval Air Squadron and captured the ship dead in the water, taking off all of the men, and the body of Omar Alberto Rupp, the boatswain of the Argentine trawler, killed by the impact of the bomb.
A British boarding party, consisting of Lieutenant Francis Anthony Blair Fasson, Able Seaman Colin Grazier, and Canteen Assistant Tommy Brown, from destroyer HMS Petard recovered the cryptographic materials, but the U-boat sank before the Enigma cipher machine could be brought out.
Leasor's 1978 book, Boarding Party, about an incident from the Second World War that until that time was secret, was turned into a film, The Sea Wolves, starring Gregory Peck, Roger Moore and David Niven.