Inside Submarines

Believe it or not, submarines date back to the seventeenth century! Discover how they developed from early designs such as the one-person Turtle into streamlined, stealthy warships. Along the way, you''ll look right inside a German U-boat, find out how a sub dives and surfaces, and see sonar systems and video periscopes at work. From torpedoes to nuclear reactors, learn how submarine technology an...