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Back to 400 Years of Subs A typical WWII U.S. submarine, the "thick skin" Hammerhead, SS-364. Wisconsin's Manitowoc Shipyard developed this sideways technique to accommodate launching a boat into a narrow river.  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 |