U-255 was transferred to Loch Eriboll, and then Loch Ryan on 14 May 1945 for "Operation Deadlight".[1] She was towed out to sea by HMS Cubitt and on 13 December was sunk by Beaufighter aircraft of No. 254 Squadron RAF with RP-3 rockets.[30] in position 51°16′N 13°38′W﻿ / ﻿51.267°N 13.633°W﻿ / 51.267; -13.633Coordinates: 51°16′N 13°38′W﻿ / ﻿51.267°N 13.633°W﻿ / 51.267; -13.633, south west of Ireland.[1]