"It must have triggered automatically when the lock cycled."

A green light appeared on the identiplate, and the lock cycled.

As the lock cycled and its inner door slid open, Sondra for the first time saw her reception committee.

The lock cycled quickly, and he stepped onto a ship that was uncannily silent.

The lock cycled and we entered a long, sloping tunnel, then passed through two pressure doors.

When the lock cycled to vacuum, the outer hatch opened.

Air, and sound, returned as the lock cycled.

The lock cycled, opened again on an empty chamber.

The lock cycled open and a small, lonely figure emerged.

The lock cycled shut, the time lock kicking in again.