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Back to 400 Years of Subs The British D-1, 1908-1918. Note the shift from the Holland porpoise-like hull shape to that of a surface ship. Common in all navies of the day, this shift marked an acknowledgment that submarines would spend most of their lives on the surface and as such needed sea-keeping qualities not found in a streamlined 'underwater' hull.  Back to 400 Years of Subs Tour U-869 | Sole Survivor | Hazards of Diving Deep 400 Years of Subs | Map of Lost U-Boats | Fire a Torpedo Resources | Transcript | Site Map | Hitler's Lost Sub Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |