Quote:
Originally Posted by reillyfam
in the looking glass you could only lock the door from the inside not out. Thats why Charlie had to die
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Here is a picture of a watertight door which has been locked using the hatch's dogs. I circled the dogging latches so you can see what locks the door from the inside. Once those dogs are thrown, the door can only be opened by "undogging" the hatch.
Those dogging latches are designed to keep the door closed against greater pressure than the wheel mechanism could withstand.
That's why Desmond couldn't get in.
Charlie had dogged the hatch.