As he steps out onto the marbled surface, a shoesized area reaches up to meet his foot. Each step raises to exactly the same level, creating the illusion of a perfectly flat floor that only appears when he's about to step on it. If he stumbles, the floor changes to lessen the stumble.

The imposing airlock door hinges outward, attached to the top of the door. It's designed to be opened manually, so there is a counterbalancing mechanism that he's likely seen a schematic of in passing during his studies. This means he just has to move the mass, and not also hold its weight up against the slightly higher than earth gravity the entire time, which should make this entirely doable.

Well, if he could get started. While the mechanism seems fine, the early part of the descent, before the hull ruptured and could equalize the pressure inside and outside, put a lot of pressure on this door. This wedged it in place, misshaping the edges.

As he pulls the lever, he can hear a seal open and air rush into the airlock, but he doesn't manage to move the door at all.  The floor near the bottom of the door ripples in response to his actions. Does he keep straining?