German submarine U-30 was a Type VIIA U-boat built for Nazi Germany's Kriegsmarine, reflecting the clandestine naval rearmament preceding World War II. Her keel was laid on 24 January 1936 by AG Weser in Bremen, and she was launched on 4 August 1936 before being commissioned on 8 October 1936 under the command of Kapitänleutnant Hans Cohausz. U-30 measured approximately 64.5 meters in length, with a beam of around 6.2 meters, and a draft of 4.37 meters. She had a displacement of around 626 tons surfaced and 745 tons submerged. Powered by two MAN 6-cylinder 4-stroke diesel engines producing between 2,100 and 2,310 PS, and two Brown, Boveri & Cie electric motors delivering 750 PS, she could reach a maximum surface speed of 17 knots and a submerged speed of 8 knots. Her operational range was extensive, with a surfaced range of 6,200 nautical miles at 10 knots and a submerged endurance of approximately 73–94 nautical miles at 4 knots. U-30 was armed with five torpedo tubes—four in the bow and one in the stern—carrying eleven torpedoes, and equipped with an 8.8 cm deck gun plus a 2 cm anti-aircraft gun. During her active service, U-30 conducted eight war patrols, sinking 16 merchant ships totaling over 86,000 GRT, and damaging other vessels, including the British battleship HMS Barham. Notably, she sank the passenger liner SS Athenia on 3 September 1939, shortly after the outbreak of war, under the command of Fritz-Julius Lemp. This attack was significant as Athenia was the first civilian passenger ship sunk in WWII, resulting in the loss of 112 lives. U-30's early war patrols saw her operating in the North Sea and the Atlantic, including the Bay of Biscay, where she sank multiple ships, primarily merchant vessels, and damaged the battleship HMS Barham. After her eighth patrol in August 1940, U-30 was withdrawn from front-line combat and reassigned to training roles. She was eventually scuttled on 5 May 1945 at Flensburg to avoid surrender, later raised and broken up in 1948. Her service marked her as an active participant in early naval warfare and a symbol of Germany’s clandestine rearmament efforts prior to WWII.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.