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Back to 400 Years of Subs The Navy modified 52 boats, adding snorkels, removing guns, streamlining superstructures, and greatly increasing battery power. They gave another 19 boats some improvements. The net result: vastly increased underwater speed and endurance.  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 |