U-Boat 110 forward torpedo room controls.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...m_fullsize.jpg
More: https://en.wikipedia.org/wiki/German...e_U-110_(1940)
Previously:
Submarine cable cross-section - photo
steam-powered submarine
The H.L. Hunley, the first submarine to sink a warship
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