DiCinema

It would be expected that the Emergency Airlock would normally have air in it, so that any crew member could enter it from inside Discovery, either to carry out any maintenance, or if they were needed to assist with anyone outside. In the latter case they would enter it wearing a space-suit, and after the inner door was closed, the airlock would be de-pressurised and the outer door opened.
As there is no apparent way for Bowman to de-pressurise the airlock whilst in the space-pod - as HAL would certainly not do so if asked - Bowman opens the outer door using the pod's waldoes. When he does this, the air inside would escape, which should result in the pod being temporarily blown around. In addition, as the air escapes to a vacuum, it would crystallise due to the water vapour content.
Neither of these effects are seen.

Film

2001: Odissea nello spazio (1968)

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