German submarine U-509 was a Type IXC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 1 November 1940 at the Deutsche Werft yard in Hamburg as yard number 305. She was launched on 19 August 1941, and commissioned on 4 November 1941 under the command of Korvettenkapitän Karl-Heinz Wolff.
German submarine U-502 was a Type IXC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 2 April 1940 at the Deutsche Werft yard in Hamburg with yard number 292, launched on 18 February 1941 and commissioned on 31 May under the command of Kapitänleutnant Jürgen von Rosenstiel.
German submarine U-504 was a Type IXC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 29 April 1940 at the Deutsche Werft yard in Hamburg as yard number 294, launched on 24 April 1941 and commissioned on 30 July 1941 under the command of Korvettenkapitän Hans-Georg Friedrich "Fritz" Poske. Initially attached to the 4th U-boat Flotilla for training, the U-boat was transferred to the 2nd flotilla on 1 January 1942 for front-line service. She was a member of six wolfpacks.
German submarine U-96 was a Type VIIC U-boat of the German Navy (Kriegsmarine) during World War II. Her keel was laid down on 16 September 1939, by Germaniawerft, of Kiel as yard number 601. She was commissioned on 14 September 1940, with Kapitänleutnant Heinrich Lehmann-Willenbrock in command. Lehmann-Willenbrock was relieved in March 1942 by Oberleutnant zur See Hans-Jürgen Hellriegel, who was relieved in turn in March 1943 by Oblt.z.S. Wilhelm Peters. In February 1944, Oblt.z.S. Horst Willner took command, turning the boat over to Oblt.z.S. Robert Rix in June of that year. Rix commanded the boat until 15 February 1945.
German submarine U-66 was a Type IXC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 20 March 1940 at the AG Weser yard at Bremen, launched on 10 October and commissioned on 2 January 1941 under the command of Kapitänleutnant Richard Zapp as part of the 2nd U-boat Flotilla.
The Black Sea Campaigns were the operations of the Axis and Soviet naval forces in the Black Sea and its coastal regions during World War II between 1941 and 1944, including in support of the land forces.
German submarine U-177 was a Type IXD2 U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 25 November 1940, at the DeSchiMAG AG Weser yard in Bremen, as yard number 1017. She was launched on 1 October 1941, and commissioned on 14 March 1942, under the command of Kapitänleutnant Wilhelm Schulze. After a period of training with the 4th U-boat Flotilla at Stettin, the boat was transferred to the 10th flotilla on 1 October 1942, and based at Lorient, for front-line service, she was then reassigned to the 12th flotilla at Bordeaux on 1 December.
German submarine U-652 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 5 February 1940 at the Howaldtswerke yard at Hamburg, launched on 7 February 1941, and commissioned on 3 April 1941 under the command of Oberleutnant zur See Georg-Werner Fraatz.
German submarine U-65 was a Type IXB U-boat of Nazi Germany's Kriegsmarine during World War II. Over the course of six war patrols between 9 April 1940 and 28 April 1941, she sank twelve ships and damaged three others for a total loss of 88,664 gross register tons (GRT).
Щ-213 was a Soviet Navy Shchuka-class submarine, Type X. She was built at the Sudostroytelnyi zavod imeny 61 kommunara in Mykolaiv, Ukrainian SSR, and entered service in October 1938 with the Soviet Black Sea fleet.
German submarine U-442 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.
Щ-215 was a Soviet Navy Shchuka-class submarine, Type X. She was built at the Sudostroytelnyi zavod imeny 61 kommunara in Mykolaiv, Ukrainian SSR, and entered service in October 1938 with the Soviet Black Sea fleet based at Sevastopol. Shch-215 survived the Second World War, was reclassified С-215 in 1949 and was decommissioned in 1955.
Submarine warfare in the Black Sea in World War II during 1941 primarily involved engagements between submarines of the Soviet Black Sea Fleet attacking Axis merchantmen defended by Romanian and Bulgarian warships. These engagements were a part of the naval Black Sea campaigns between Axis and Soviet naval forces.
The Gulf of Finland U-boat campaign lasted in the Gulf of Finland during the World War II against the Soviet Union between summer 1944 and spring 1945. During the campaign Finland switched sides and joined the Allies.
Submarine warfare in the Black Sea in World War II during 1942 involved engagements between primarily submarines of the Soviet Black Sea Fleet attacking Axis merchantmen defended by Romanian and German naval warships. These engagements were a part of the Black Sea campaigns between Axis and Soviet naval forces.
Submarine warfare in the Black Sea in World War II during 1944 involved engagements between submarines of the Soviet Black Sea Fleet attacking Axis merchantmen, defended by Romanian and German naval warships, as well as German U-boats and Romanian submarines attacking Soviet merchants on the eastern Black Sea. Before the conclusion of the campaign, Romania joined the Allies after King Michael's Coup. These engagements were a part of the naval Black Sea campaigns.
The Soviet submarine Baltic Sea campaign in 1941 was launched by the Soviet Navy at the early stage of Operation Barbarossa. The offensive was hampered by the quick German ground advance and the retreat of Soviet naval vessels from the main Baltic harbors.
The Soviet submarine Baltic Sea campaign in 1944 was launched by the Soviet Navy to harass enemy shipping and naval military assets of the Nazi Germany on the Eastern Front during World War II.
The Soviet naval Baltic Sea campaign in 1945 was launched by the Soviet Navy to harass enemy shipping and naval military assets of Nazi Germany on the Eastern Front during World War II. Both submarines and surface units of the Soviet Navy were employed. The campaign scored successes during Operation Hannibal.
The Barents Sea campaign in 1941 was a submarine operation in the Arctic waters of the Barents Sea during World War II. It was a combined Soviet and British campaign, with boats departing from Polyarny to harass German shipping along the Norwegian coast.
Bulgaria 
Germany 
Romania 
Italy 
Soviet Union