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Submarines are essentially containers that hold people and air. Learn how these remarkable vessels dive, surface and maneuver through the ocean. Howstuffworks How Submarines Work
www.howstuffworks.com/submarine.htm

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NOVA Online presents Submarines, Secrets, and Spies NOVA Online | Submarines, Secrets, and Spies
www.pbs.org/wgbh/nova/subsecrets

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