An eddy of fresh air told him without looking that the door had cycled open.

The door cycled open, revealing the great spherical chamber beyond.

The door cycled open and he stepped back into prison.

The door cycled and a tall shadow followed a shorter into the bay.

He led his team into the airlock, and the inner door cycled shut behind them.

The door appeared in the blank far wall and cycled open.

It was still visible as the outer door cycled shut.

After a brief wait the door cycled open and Joe entered.

He hit the airlock controls, and the outer door cycled open.

It did the trick, freezing him into position until the door cycled shut.