 The U-boat was not laid down until 11 March 1935, and launched on 29 June 1935, within weeks of the Anglo-German Naval Agreement, which granted Germany parity with the British Empire in submarines.Commissioned on 18 July 1935 with "Kapitänleutnant" Kurt Freiwald in command, "U-7" mainly served as a training boat except for two brief deployments during the Invasion of Poland in 1939 and Operation Weserübung in 1940.On 18 February 1944, west of Pillau, "U-7" sank in what is believed to have been a malfunction during a diving manoeuvre.