Operation Deadlight

Forty-two surrendered U-boats moored at Lisahally, Northern Ireland, June 1945
Polish Navy destroyer ORP Krakowiak towing German Type XXIII U-boat U-2337 out to sea for scuttling on 28 November 1945

Operation Deadlight was the code name for the Royal Navy operation of November 1945 – February 1946 to scuttle German U-boats surrendered to the Allies after the defeat of Germany near the end of World War II.