Other top explanations are forgetting that moonpools can be below the water line. This is because the air in the moon pool room is the same pressure as the water outside the moon pool. Experiment to show a similar effect: invert a clear glass over some water push the glass underwater, there eill be an air pocket in side. That is a moon pool the air compresses until it is the same pressure as the water outside so the water cant get in. On a ship they can pump more air in to push out more water to make the water stay at the same level.
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