About that door to the outside without an airlock

So the destruction of part of the habitat because of a single non-airlocked door caused a lot of critics like myself to point out how terrible a plot device that was. However, if you go here:

http://www.space.com/35101-mars-ice-home-design.html

you'll note from the design that there are 2 airlocked exits and then a 3rd exit without an airlock. For emergency egress I guess. And in an emergency you'd want to be able to open the door quickly, so I would guess that the door would open to the outside so you wouldn't have a problem with air pressure. So maybe it made sense after all. You just have to assume that your psych profiles are accurate.

When you do things right, people won't be sure you've done anything at all. -God