Operation Deadlight was the code name for the scuttling of U-boats captured by the Allies after the end of World War Two.
Of the 154 U-boats surrendered, 121 were scuttled in deep water off Lisahally, Northern Ireland or Loch Ryan, Scotland in late 1945 and early 1946. On February 12, 1946 at 10:04am, U-3514 received the dubious honor of being the last U-boat sunk by Operation Deadlight. The other 33 were used for various tasks and then sunk; e.g., U-1105, sunk on explosives trial in the Potomac in 1948.
