[quote=@Tenish the Mighty]
Hundred's on this shit. Hold tight.

<Snipped quote by Kalas>

Why in the Multi-limbed, Money-hunting Masters of Gyges would the outer airlock door be on hinges?
[/quote]

I was talking about the inner...

[quote=@SimplyJohn]
With a silent hiss of escaping gas the door seal snapped off and the hatch swung open. 
[/quote]

If it [i]swung open[/i], it would imply that there are some form of hinges in order to operate correctly.

EDIT:

My original thought was that it remained on a set of runners, embedded into the floor, that the door would slide over. But after re-reading Simply's post, it turns out not to be the case.