You know, “hatch”. But it’s funnier saying door. Could a ship just dock with it, equalise pressure, and open the hatch? Or is there some sort of security? I tend to think there’s no lock because of a macabre situation where the crew are dead and the station is being recovered. But it’s amusing to think in space they don’t need to keep the doors locked.
Not necessarily. There are lots of comparisons to submarines but it’s more comparable to airplanes. Part of the security on a plane is that it is physically impossible to open the door while the plane is flying. The pressure difference between the pressurized inside and thin air outside would require superhuman force to open.
In a similar vein, when the ISS was constructed it wasn’t initially pressurized. This would make opening the door from the outside trivial from a pressurization standpoint. As long as the only means to pressurize it could be triggered from inside, there’d be no way it would be pressurized without someone inside.