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If you've ever been on a tropical vacation with your child, you may have gone underwater in a special kind of submarine that allows the people riding inside to see fabulous sea creatures—all kinds of bright and unusual-looking fish and plants and other things—without getting wet. If your child hasn't taken a ride in a submarine, he's probably read about one, or seen one on television, or learned about submarines in a class or on the Internet. But how does a submarine actually work? Here's a fun way to figure it out.