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Approximately 4/5 or 3/4 of a boat remains underwater while it is on the surface, or around 75-80%.

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Q: How much of a nuclear submarine is under water when it has surfaced?
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How did they fit the big guns on the submarine?

The cannon (gun) is mounted onto a mount. The mount is bolted onto the deck. The gun can go under-water; it simply has to be maintained when surfaced (cleaned & oiled).


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The submarine is under water.


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