She was to have received the name HMS Tutankhamen[?] but was lost before this was formally done. The Prime Minister, Winston Churchill had minuted the Admiralty on 5 November 1942 December 19 and again on 27 December, saying that all submarines should have names. In the final minute, he provided a list of suggestions and insisted that all unamed submarines be given names within a fortnight.
P.311 was a group 3 boat built by Vickers Armstrong at Barrow and commissioned on 5 March 1942 under the command of Lieutenant R.D. Cayley. She was one of only two T-class submarines completed without an Oerlikon anti-aircraft gun, the other being HMS Trespasser[?].
She joined the 10th Submarine Flotilla at Malta in November 1942, and was lost with all hands between 30 December and 8 January 1942 whilst en route to Maddalena[?], Sardinia where she was to attack two Italian 8-inch gun cruisers using Chariot[?] human torpedoes carried on the casing as part of Operation Principle[?]. It was assumed that she was mined.
wikipedia.org dumped 2003-03-17 with terodump