The robot had built a small airlock so that at least here inside they could open their helmets.

They opened it without setting off an alarm and entered a small airlock.

The inner door of that small airlock was closed.

He got up and walked over to the small airlock, which he no longer needed now.

Then came the tedious business of working through the small airlock, one at a time.

The ship was roughly egg-shaped, with a small airlock in its side.

He pulled up next to the small airlock.

Just inside the small airlock was an elevator, with an other function box beside it.

She heard Peard's voice commanding someone to ready the small airlock.

I walked carefully to the small airlock which was hidden from the outside by a high wall of stone.