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Why would you make a submarine out of concrete?

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Published in Daily Trivia

Russian submarine designers are building military submarines out of concrete. Because concrete becomes stronger under high pressure, "C-subs" could settle down to the bottom in very deep water and wait for enemy ships to pass overhead. Concrete would not show up on sonar displays (it looks just like sand or rocks), so the passing ships would not see the sub lurking below.

 

 

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