HMS Affray (P421)
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| Career |  |
|---|---|
| Ordered: | Late May 1943 |
| Laid down: | 16 January 1944 |
| Launched: | 12 April 1944 |
| Commissioned: | 25 November 1945 |
| Struck: | June 1951 |
| Status: | foundered 16 April 1951 |
| General Characteristics | |
| Displacement: | 1,385 tons surfaced 1,620 tons submerged |
| Length: | 281 feet 9 inches (85.9 metres) |
| Beam: | 22 feet 6 inches (9.9 metres) |
| Draught: | 17 feet (5.2 metres) |
| Propulsion: | diesel-electric, 4,300 hp surfaced, 1,250 hp submerged |
| Speed: | 18.5 knots surfaced 8 knots submerged |
| Range: | 10,500 miles at 11 knots (16,890 km at 20 km/h) surfaced |
| Complement: | 6 officers and 55 men |
| Armament: | one 4 inch gun one Oerlikon 20 mm cannon three .303-caliber machine guns ten 21 inch torpedo tubes (four bow, two bow external, two stern, two stern external), 20 torpedoes |
HMS Affray (P421), a British Amphion class submarine was the last Royal Navy submarine to be lost at sea, on 16 April 1951, with the loss of 75 lives. All vessels of her class were given names beginning with the letter A; she was the only ship of the Royal Navy to be named for a particularly noisy and disorderly fight.
Affray was built in the closing stages of World War II. She was one of 16 submarines of her class which were originally designed for use in the Pacific Ocean against Japan.
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[edit] History
[edit] Early 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 in submarines at the time of her launching. They were the culmination of a rapid submarine development driven by the war. Some elements of her design were taken from captured 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 two huge air conditioners, refrigeration, 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 one 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 exercises all over the globe, visiting such places as Australia, Singapore, Japan, Morocco, South Africa, Pearl Harbour and Bergen.
[edit] 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 which could be raised and lowered from the control room. 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 meter above the hull, this housed the main induction valve. This very important casing was totally concealed and protected by the free flooding hull. The snort mast on the Affray was designed for both air intake and exhaust vent, this was later changed so the snort mast was 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 Lt John Blackburn DSC was appointed CO and given the task of bringing her and the new crew up to operational status.
[edit] Loss
On 16 April 1951, Affray set out on a simulated war mission called "Exercise Spring Train" with a reduced crew of 50 from 61. They were joined by two corporals and a sergeant from the Royal Marines, a Commander (Engineer), a naval instuctor, seven Lieutenants in the engineering branch, and 13 sub-Lieutenants. The last two groups were undergoing essential submarine officer training. 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 homebase at about 1600 hrs, and made normal contact to confirm position, course, speed etc at 2100 hrs, and indicated she was preparing to dive. When she missed her 0800 report due the next day she was declared missing and an immediate search began.
[edit] The Search
Shore stations called Affray all day and 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. Also out of Portland, they were joined by the submarines Scorcher, Scythian, and Sirdar all flying 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 sitting on the bottom. 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. At the time Affray went missing it was such big news in Britain it relegated the first events that culminated in the Suez Crisis to page two of the national newspapers. 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 in the first place. During the search a morsecode signal (via tapping on the submarine hull) had been received by two of the searching ships reading "We are trapped on the bottom", this did not help in locating the sub. After three days the search was slowed down and fewer ships were used to locate Affray. In Britain the missing submarine was getting a lot of publicity. Rumours abounded of mutiny, seizure by the Russians etc. Meanwhile the Royal Navy continued its search. During the search many strange things happened, the strangest was a massive object found on the bottom by sonar, the search vessel realising it could not have been Affray due to its size continued on, when it returned several days later to establish what it was, it had gone. Another strange event was the wife of a skipper of one of Affray's sister submarines claiming to see 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). Due to there being so many shipwrecks littering the English Channel (161 were found, most of them casualties of World War II), it was many months before Affray was located.
[edit] Discovery
On 14 June the primary search vessel Loch Insh made a sonar contact near Hurds Deep, a deep underwater valley in the 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 quite skeptical about using. As soon as it was sent down the very first thing the camera picked up were the words "YARFFA" - Affray backwards. At last she had been found. She was 17 miles northwest of Alderney, a lot closer to France than England. She lay slightly to port facing northeast in 86 meters of water, and 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 only attached by 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 (sadly, 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).
[edit] Cause of loss
There have been many reasons put forward as to what caused the submarine to sink, the snort mast was broken and lay next to the hull so initially it was 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 that it was more likely that it had been broken when the sub hit the bottom. A battery explosion has also been suggested as a possibility. The Royal Navy had 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 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 sunk, mostly due to the various dangers to any divers. A more recent theory put forward by a few experts 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 up to 13 tons of water per minute entering the submarine this could have caused her 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 flow of water in. 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.
[edit] Re-visited
Almost half a century after the loss, Innes McCartney, an experienced Trimix diver with a passion for sunken submarines, obtained the position of Affray from the Ministry of Defence and dived down to the sunken submarine. He reported:
- "As we descended down the shotline, a large dark shape emerged from the gloom. Little ambient light penetrates to 83 metres even on a good day on the edge of Hurd Deep and it was a while before we recognised the unmistakable shape of a submarine. She is a hugely impressive sight, sitting almost totally clear of a hard seabed, offering in excess of 10 metres of relief in places. Our lighting showed that she is now covered with sponges and anemones, offering some welcome colour in the darkness. The first thing that struck me about the wreck was her sheer size. She is one of the largest submarine wrecks in the Channel and a diver is hard pushed to swim all the way around her on a single dive. She lies slightly over on her port side, with her bows pointing Northeast. She is not very heavily netted with only a few craypots caught up around the hull. The wreck is in a very good state of preservation considering the 47 years she has been on the seabed. Her bridge is completely intact with speaking tubes, the projector binnacle and radio aerials all in evidence. On the side of the conning tower her navigation lights are present and the conning tower ladder is still in place. Her periscope shafts stand proudly upright and even the cables than ran between them are still there. Forward of the tower the foredeck is intact with the gun layers hatch clearly visible. I was keen to find the cradle in which the snort mast was located when in use. This was on the port side, aft of the tower and on our second dive on the wreck I found it. The base of the snort mast was still in place, with the area where the mast broke off clearly visible. On a later visit to the Royal Navy Submarine Museum, I saw the base of the section of the mast that was raised. They would still fit together perfectly. The fore and aft hydroplanes are still in position and the external torpedo tubes on the bow are a very impressive sight. Aft of the conning tower, there is evidence of the salvage attempts made by the Royal Navy in 1951. The diving team discovered no other damage to the wreck apart from the missing snort mast. This is in accordance with the findings of the Royal Navy’s investigation. She remains significant and salutary reminder of our naval heritage. Very few divers in the UK have the experience and capability to undertake such a dive. This should ensure that the Affray remains undisturbed for posterity. She is a war grave and the final resting place of 75 naval personnel and this should be respected."
To this day, the crew are entombed in what is possibly an airtight submarine on the northern edge of Hurds Deep. As of 2001, under the Protection of Military Remains Act of 1986 (which was created as a result of the Falklands War), Affray was made a controlled site, making it illegal to dive her without a permit from the Ministry of Defence.
[edit] Officers and Men lost on HMS Affray
Abbreviations used
- (E) - Engineer
- L/Sea - Leading Seaman
- Elect - Electrician
- P.O. - Petty Officer
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[edit] See also
[edit] External links
| Amphion-class submarine |
| Acheron | Aeneas | Affray | Alaric | Alcide | Alderney | Alliance | Ambush | Amphion | Anchorite | Andrew | Artemis | Artful | Astute | Auriga | Aurochs |
List of submarines of the Royal Navy |
