Some Details

I think about space and starships from time to time. Thanks Roberta X!

Since I look at things from a GM to Player perspective most of the time I like think about details.

Hatches.

Sliding doors and iris-valves are neat, but would be complicated. Think about the materials you need to use to prevent things like vacuum welding.

I have described sliding hatches that had double doors. Each face moves towards the center, away from the jamb so that in case there's pressure on one side and not the other, the vacuum side will be pressed more firmly in its coaming and cannot be slid into its pocket until both sides are centered.

Swinging hatches are likely to be more common. If you put a geared mechanism on the door, the pressure will not prevent it from opening or closing (nor will high g-loads). But what keeps a bone head from opening it at the wrong time?

I propose a simple diaphragm bolt. Springs hold it centered if there's pressure on both sides. If there's a pressure drop, the air pushes the diaphragm against the springs and the bolt slides into the opening mechanism and prevents it from opening. This same mechanism can also be used to trip the closing mechanism. I envision the slider looking like an emergency stop button. Slap it, the spring loaded door closes FAST. Vacuum pulls it, door closes. What if you need to open it? You pull it out, and hold it while the door opens. You could override the closure mechanism by wedging something under the button, there might even be something built in for that. No lights, you can feel for the button. If it's down you know the other side is in vacuum.