[little jeremiah]

As a general rule, naval ships have very few spaces which are locked from the outside and even fewer that cannot be opened from the inside. It is a basic safety/ damage control precaution.
That doesn’t mean that internal door latches can’t be changed relatively fast.

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Thank you very much for that info. Makes total sense. And of course door latches could be retrofitted easily.

[xone]

And of course door latches

You are onboard a ship, hatch's latches.