Compare: Chaffin, Tom (2010). The H. L. Hunley: The Secret Hope of the Confederacy. Macmillan. p. 53. ISBN9781429990356. Consultado el 14 de julio de 2016. «Bauer's boat made a promising start, diving in tests in the Baltic Sea's Bay of Kiel to depths of more than fifty feet. In 1855, during one of those tests, the boat malfunctioned. The Brandtaucher plunged fifty-four vertical feet and refused to ascend from the seafloor. Bauer and his crew – leaving their craft on the bottom – barely escaped with their crew-mates lives.»
