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Back to 400 Years of Subs The Deep Submergence Rescue Vehicle is air-transportable and able to mate with and remove crew from U.S. submarines to a depth of at least 5,000 feet. Two were built; neither has ever been used.  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 |