German_submarine_U-616--Otto_Kron

German submarine U-616 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine, for service during World War II.
She was laid down on 20 May 1941 by Blohm & Voss, Hamburg as yard number 592, launched on 8 February 1942 and commissioned on 2 April 1942 under Oberleutnant zur See (Oblt.z.S.) Johann Spindlegger.
On 8 October 1942, Spindlegger was replaced by Oblt.z.S. Siegfried Koitschka, who commanded her until she was sunk on 17 May 1944.