30th U-boat Flotilla ("30. Unterseebootsflottille") of Nazi Germany's Kriegsmarine was formed in October 1942. Six U-boats reached the Black Sea after a transport over land and canals [1] and operated from the harbours of Constanţa and Feodosiya[2] from 1942 to 1944.
^The 30th Flotilla was founded in October 1942 under the command of Kptlt. Helmut Rosenbaum. The boats reached Constanza after a transport over land and canals. The operational area was limited to the Black Sea. Its history ended in September 1944, when the three last Flotillas boats U-19, U-20 and U-23 were scuttled on 10 and 11 September 1944 near the Turkish coast. – "Uboat.net". The Flotillas – 30th Flotilla. Archived from the original on 20 November 2009. Retrieved 13 November 2009.