German Submarine UC-56 (KptLt/in Wilhelm Kiesewetter). Caption: At Christabel, Spain where she interned herself, 24 May 1918, after injuries received in an encounter with a U.S. Patrol Yacht. The explosion of one of the Yacht’s depth charges was followed by a second detonation after which splinter wood and much heavy oil came to the surface. The UC-56 is primarily a mine-laying submarine, her elaborate camouflage is distinct in the photograph. NH 111101.