Now there was the sound of a seeming kiss as an airtight hatch in the bottom of the saucer was opened.

The tall, airtight swinging hatch was almost big enough to get through without ducking- almost.

Dan sat behind the driver's seat as the driver herself closed the airtight hatch and then checked out the cab's pressurization.

At the opposite end, the corridor branched into a T, each subsequent hallway ending in a bulkhead with an airtight hatch.

He popped the airtight hatch and it opened with a wheezing sound.

The airtight hatch up the passageway slammed shut.

In the floor of the suit deck was an airtight hatch and another ladder down to the lock itself.

The airtight hatches were locked down; the waving crowd became an electronic image on the train's visicomm system.

He punched down the switches that shut the airtight hatches between every section of the living quarters on the levels below.

The airtight hatches will keep them safe, as long as they don't try to get out.