She encounters an unrecovered Second World War magnetic mine. The submarine could also carry a diver in the nose rather than a magnetic mine. On May 16, she suffered minor damage after striking a magnetic mine at Halmahera. On 25 June a magnetic mine detonated in her wake. At 19&colon;55, "Gneisenau" detonated a magnetic mine off Terschelling. "Kirov" was damaged by a German magnetic mine while leaving Kronstadt on 17 October 1945. "Amakusa" was damaged by a magnetic mine at Chichi-jima on 20 December 1944.