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There are 2 primary reasons:

1. Pressure in the boat helps to seal hull valves and other mechanical equipment that rely on seals to keep water out of the boat.

2. Monitoring the air pressure in the boat is a primary way to discover leaks or flooding; if there is a drop in pressure for no apparent reason, it's a good bet that water is coming in from somewhere.

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10y ago
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Q: Why do they pressurize submarines?
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