Ever see one of those circular life preservers tossed into the water? Like that.
The boat has sections that dip under water. If Those parts push away more water than the boat weighs, the boat floats. It doesn’t matter it it’s a rectangle or ring, or whatever shape. You can have a place in the middle where water comes up (a moon pool).
What sinks a boat is when a hole opens somewhere that lets water fill up a spot below the water filled with air, so that part of the boat isn’t pushing away as much water.
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