 Bargsten told his captors of several accidents that had befallen U-boats, including the sinking of at the pier in Lorient in January 1941.Another accident described by Bargsten was the collision of two U-boats in the Baltic Sea in August or September 1942, during their tactical exercises.One boat was commanded by "Oberleutnant zur See" Ulrich Pietsch of the 1935 naval term.