He flung them back against the airlock door, then reached for two more.

How could they be sure there were no airlock doors inside?

He was almost to the probe's forward airlock door when it hit!

I wasn't sure the airlock door would be a close enough fit.

"I counted the number of times the airlock door opened and closed."

It occurred to him that in such a case the two airlock doors must also be open.

That's like saying you'll just take one little step out the airlock door.

I didn't complete my attempt to open the airlock door.

The three machines were moving around near the airlock doors.

And he only missed the airlock door by a second or two.