When the outer lock opened, he took a moment to breathe in the air.

I took a quick look through the port of the outer lock.

McAndrew stood at the outer lock, ready to open it.

Then he evacuated the air from the chamber and opened the outer lock.

The outer lock opened, and air hissed out into vacuum.

Nevertheless, he released the outer lock of the reception room and let them in.

As the key turned in the outer lock we closed the door behind us.

There was a key in the outer lock of the iron door.

Beyond the outer lock a metal bridge led across the pit to safety.

Finally she heard them in the outer lock, and her heart began to beat faster.