These hatches are for ammunition storage, not escape or entry. Though the rear one could be used to escape, and the boat would have to be flooded if submerged to get the hatch open otherwise outside water pressure would prevent that.
You'll note that from inside, the rear hatch covers a well that should have a plate sealed to it's bottom but is on our model open with no cover plate in place. This being located in the galley.
The forward storage well isn't visible from inside. (At least I haven't found any.)
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"Chance favors the prepared mind"
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