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HMS Affray (P421)
HMS Affray was a British Amphion-class submarine. Affray was built in the closing stages of the Second World War. She was one of 16 submarines of her class which were originally designed for use in the Pacific Ocean against Japan. It was the last Royal Navy submarine to be lost at sea, on 16 April 1951, with the loss of 75 lives.[1] HistoryEarly history
She was laid down at the Cammell Laird yard in Birkenhead on 16 January 1944, launched on 12 April and commissioned on 25 November 1945. Affray and her sisters were state-of-the-art submarines at the time of their launching. They were the culmination of a rapid submarine development driven by the Second World War. Some elements of her design were taken from captured Nazi German U-boats. Her modular style of manufacture and all-welded hull were unique at the time. For work in the Far East she was equipped with refrigeration and two huge air conditioners, and all her accommodation was placed as far away from the engine room as possible. She also had ten torpedo tubes which made her and her class some of the most formidable submarines in the world at that time. She was sent to the submarine tender HMS Montclare at Rothesay, as part of the 3rd Submarine Flotilla, before joining her sisters HMS Amphion, Astute, Auriga, Aurochs and the submarine tender HMS Adamant in the British Pacific Fleet. The following four years Affray was on travel and took part in exercises all over the globe, visiting such places as Australia, Singapore, Japan, Morocco, South Africa, Pearl Harbor and Bergen. Modification On 11 March 1949 she was transferred to the 5th Submarine Flotilla reserve and entered drydock to be retrofitted with a snort mast (snorkel device)—a pneumatically raised and lowered steel tube which, when in the vertical position, worked as an air induction/exhaust emission device. Once vertical it was self-locking and drew air into the submarine at periscope depth, permitting the submarine to charge batteries and run diesels for propulsion below the surface, allowing the sub to remain underwater. At the point where the air intake entered the pressure hull of the submarine, there was a bulbous casting—set about half a metre above the hull, this housed the main induction valve. This very important casting was totally concealed and protected by the free-flooding hull. The snort mast on the Affray was designed for both air intake and exhaust venting; this was later changed to be an air intake only and the exhaust was moved to the rear of the conning tower. The snort mast had a float valve that would close automatically if the submarine dropped below periscope depth. In December of that same year Affray was sent to the Mediterranean; it was recorded during deep dives in this sea that she began "leaking like a sieve" and that the Admiralty-class diesels started leaking oil. In January 1951 Affray was transferred to Portsmouth Naval base to join Reserve group "G". In March she was brought out of reserve, and Lieutenant John Blackburn DSC was appointed CO and given the task of bringing her and the new crew up to operational status. LossOn 16 April 1951, Affray set out on a simulated war mission called Exercise Spring Train.[1] The submarine had a reduced crew of 50 from 61. They were joined by one sergeant, one corporal, and two marines from the Special Boat Service; a commander (Engineer), a naval instructor, seven lieutenants in the engineering branch, and 13 sub-lieutenants. The last two groups were undergoing an essential submarine officer training course.[1] This made her complement 75 in total. Her captain's orders were unusually flexible: the Marines were to be dropped off somewhere along the south west coast of England—the captain told the Admiralty he had chosen an isolated beach in Cornwall—come ashore and return under the cover of darkness. The exercise was expected to continue until Affray was due to return to base on 23 April for essential defect repairs including a leak in a battery tank. Affray left her home base at about 1600 hrs, and made normal contact to confirm position, course, speed etc at 2100 hrs, and indicated she was preparing to dive. The last ship to see her on the surface was the 'Co' Class destroyer HMS Contest returning to Portsmouth that evening. As they passed each other, both vessels piped the side. When she missed her 0800 report due the next day she was declared missing and an immediate search began. SearchShore stations called Affray all day. HMS Agincourt led a fleet of search vessels which eventually totalled 24 ships from four nations. The Portland 2nd Training Flotilla which included HMS Tintagel Castle, Flint Castle, Hedingham Castle, and ASDIC (sonar) trials vessel Helmsdale, left Portland. The surface-vessels were joined by the submarines HMS Scorcher, Scythian, and Sirdar, also from Portland. All flew large white flags to distinguish them from the missing Affray. Sirdar later sat on the bottom for six hours while the ASDIC boats familiarised themselves with the identification of a submarine in this position. The codeword 'SUBMISS' was sent to all ships in the NATO navies to notify them of the fact the Affray was missing and all other Amphion-class boats were confined to port pending investigation as to what happened to their missing sister. There was some urgency in the initial 48 hours of the search as it was estimated the crew would not survive much longer than this if they had survived whatever had sunk the submarine. During the search a Morse code signal (via tapping on the submarine hull) had been received by two of the searching ships, reading "We are trapped on the bottom", but this did not help in locating the sub.[2] Differing accounts however state that a tapping, initially believed to be from the trapped crew, was heard, but after later investigation was ruled by the admiralty to be from other ships involved in the search.[3] After three days the search was slowed down and fewer ships were involved. The disappearance of Affray became a prominent news item in Britain, and relegated the first events that culminated in the Suez Crisis to page two of the national newspapers. Rumours abounded of mutiny, and even seizure by the Russians. Meanwhile the Royal Navy continued its search. During the search many strange things happened, including that the wife of a skipper of one of Affray's sister submarines claimed to have seen a ghost in a dripping wet submarine officer's uniform telling her the location of the sunken sub (this position later turned out to be correct)[4]— she recognised him as an officer who had died during the Second World War, not a crew member of Affray. As there were so many shipwrecks littering the English Channel (161 were found, most of them sunk during the Second World War), it was almost two months before Affray was located. Discovery On 14 June the primary search vessel HMS Loch Insh made a sonar contact on the very edge of Hurds Deep,[5] a deep underwater valley in the English Channel. It was the same location where an oil slick had been sighted at the same time Affray vanished and was in an area that had been searched before. HMS Reclaim arrived several hours later after an excited call from the Captain of Loch Insh who, as an ex-submariner was convinced this was Affray. A dive was made down to the contact and the diver reported seeing a long white handrail before being dragged along with the flow of the current. Due to the weather being worse than usual the crew decided to use the underwater camera that they had previously been sceptical of. As soon as it was sent down the very first thing the camera picked up were the letters "YARFFA"—Affray backwards. The submarine was 17 miles (27 km) northwest of Alderney, a lot closer to France than England. She lay slightly to port, facing northeast in 86 metres (282 ft) of water. During the next few months she slid a little more to port where she appears to have rested on a roughly 50 degree angle. Divers could find no evidence of collision or damage to the hull, casing or bridge and it was noted that the search periscope and ANF radar mast were extended, indicating she had been at periscope depth when she foundered. However, the snort mast had been broken and lay next to the sub, attached by only a thin shred of metal. The hatches and torpedo doors were all shut, and the two emergency buoys were still located within the casing, although the after one could not have been released as the hinged wooden gratings retaining it had been wired shut (it was later discovered that it had been wired shut because it often broke free whilst the sub was underway). It was obvious that no attempt to escape had been made. The only external clue that the crew had done anything to rectify their dilemma was the bow hydroplanes being set to hard arise; the bridge telegraphs also were in the stop position. The snort mast was the only part of the submarine that was recovered, and it was later found to be of faulty manufacture. This may have contributed to the sinking of Affray (see below). Investigation Several reasons have been put forward for the cause of the submarine's sinking.[1] The snort mast was broken and lay next to the hull so it was initially thought that this had broken and flooded the submarine. After a detailed inspection of the snort mast itself, which showed no sign of being struck, it was thought more likely that it had been broken when the submarine hit the bottom (the snort mast was later tested and although it was found to be of faulty manufacture, tests indicated it should still have stood up to normal use)[citation needed]. The official board of inquiry held the broken snort to be the primary cause of the sinking.[1] However Sir Victor Shepheard, the Director of Naval Construction, disputed the finding.[1] Shepheard and others suggested that a battery explosion was also a possibility, owing to the angle at which the ship was resting on the seabed.[1] The Royal Navy tried to scan the interior when Affray was first discovered, using a primitive radioactive device. This yielded minimal information about the internal condition of the submarine, but it did seem to show that the internal valve for the snort mast was in the open position, which would indicate that at least one compartment flooded and some of the crew had drowned when she first hit the bottom (see USS Squalus for a similar situation). During this attempt one of the (pea-sized) X-ray pods was accidentally lost near the sub and the Admiralty decided against further attempts to establish why Affray sank, mostly due to the various dangers to any divers (one Royal Navy diver lost his life attempting to identify another sunken submarine during the search).[1] A more recent theory put forward by a few experts[who?] is that the snort mast dropped below the surface and the float valve (described above) jammed or somehow failed to stop the water entering the sub. With water entering at up to 13 tons per minute, this could have caused the submarine to drop rapidly to the bottom. With a reduced crew and the trainees in the way hampering activities, there would have been a delay in stopping the inflow of water. By the time the valve was shut or the flooding compartment that contained the valve sealed off, there would have been so much water aboard that even blowing all her ballast would not have been sufficient to get her to the surface. Or if the flooded compartment/s included the control room, there would have been no one alive to blow ballast. It is also possible, with trainees on board possibly operating systems, that a problem with the clutch caused the Affray to accelerate into the sea bottom disabling some parts of the submarine that would have helped her rise to the surface.[citation needed] WreckAlmost half a century after the loss, Innes McCartney, an experienced trimix diver obtained the position of Affray from the Ministry of Defence and dived to the sunken submarine. He reported:
The crew remain entombed in the submarine on the northern edge of Hurd's Deep. As of 2001, under the Protection of Military Remains Act 1986, Affray was made a controlled site,[7] making it illegal to dive her without a permit from the Ministry of Defence. See alsoReferences
PublicationsGallop, Alan: 'Subsmash - the Mysterious Disappearance of HMS Affray' published by The History Press, 2007
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