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How would you make something that stays under water for at least twenty seconds then floats back up?
Wiki User
∙ 14y ago
Maybe use the same principal as a submarine. Two water tanks begin to fill themselves with water, and therefore the craft sinks. Then, after your twenty seconds, a pump should begin to remove the water from the water tanks, causing the craft to float back to the surface. If the army have faith in this simple physics then I'm sure we can...
Wiki User
∙ 14y ago
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