They found its outer valve had been torn loose when the boat plowed across ground.

The outer valve purred open and a gangway came forth like a licking tongue.

They reached the ship and stood before the opened outer valve.

They had agreed on liquid oxygen as the cargo to dump, since it could be let boil out through the outer valves, without handling.

As she approached, a ladder swung down to the ground, an outer valve opened.

Smiling sardonically, he opened the outer valve and stepped out into ten thousand feet of air.

Wiping away tears with a gloved hand, he set his teeth and reached for the outer valve.

The same machinery that had turned on the lights and closed the outer valves had now opened a passage inside.

He retreated to the outer valve and stopped there, frowning, grasping for sanity.

"I'm in the Number Two lock, outer valve open, looking over the lip."