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Image Credit
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Description:
Cross-section drawing of a submarine with air tanks, vent, outer hull, inner hull, empty ballast tank and opening labeled
Source:
Freudenrich, C. and Brain, M. (2000). How Submarines Work: Diving and Surfacing. howstuffworks.com
License:
Copyright How Stuff Works, 2000
Source URL:
http://science.howstuffworks.com/submarine1.htm
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