Unternehmen Cerberus
HMS "H31" survived until World War II. During the war, she took part in the operation to keep the in Brest, France in November 1941 before the "Channel Dash" to German homeports in the company of and in February 1942. During the operation, "H31" was sunk by unknown causes, but most believe she was mined in the Bay of Biscay on 24 December 1941.