U-boat (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "U-boat" in English language version.

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aftenposten.no

Berg Bentzrød. Berg Bentzrød, Sveinung (3 February 2017). "Forsvaret kjøper nye ubåter fra Tyskland" [The Armed Forces are purchasing new submarines from Germany]. Aftenposten (in Norwegian). Oslo: Aftenposten AS. Retrieved 9 March 2019.

King-Hall, pp. 229–242. King-Hall, Stephen (19 May 2021). "A North Sea diary, 1914–1918 / Commander Stephen King-Hall". London: Newnes – via Internet Archive.
Crocker III, H. W. (2006). Don't Tread on Me. New York: Crown Forum. p. 310. ISBN 978-1-4000-5363-6.

Chaffin, p. 53. Chaffin, Tom (2010). The H. L. Hunley: The Secret Hope of the Confederacy. Macmillan. ISBN 978-1429990356. Retrieved 14 July 2016. Bauer's boat made a promising start, diving in tests in the Baltic Sea's Bay of Kiel to depths of more than 50 feet. In 1855, during one of those tests, the boat malfunctioned. The Brandtaucher plunged 54 vertical feet and refused to ascend from the seafloor. Bauer and his crew – leaving their craft on the bottom – barely escaped with their crewmates' lives.

"Military History Online". www.militaryhistoryonline.com. Retrieved 4 February 2019.