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The Naval term for a submarine's initial rise above the surface of the water is called "broaching", e.g., a submarine has broached the surface. It takes more effort to fully surface a boat to where it's buoyant enough to stay on the surface.

Broaching can be done intentionally or unintentionally by nature. If a boat is at periscope depth (about 65' for most boats), and sea swells are large, a big enough wave can suck a boat right to the surface without warning.

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14y ago

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