In Isaac Asimov's I, Robot novel, two scientists stationed in an asteroid where mining activities are performed say "We could flood the mines, if this weren't an airless asteroid" when considering possible emergencies they could deliberately trigger.
So the question is: Why couldn't you flood a mine in an asteroid because of its being airless?
Reference info for those who care: the quote is in the chapter "Catch That Rabbit." Here is the context:
"Well, figure it out, yourself. You're the brains you say. Ask yourself some questions. When does DV-5 go out of whack? When did that 'finger' say he did? When a cave-in threatened, or actually occurred, when delicately measured explosives were being laid down, when a difficult seam was hit."
"In other words, during emergencies," Powell was excited.
"Right! When did you expect it to happen! It's the personal initiative factor that's giving us the trouble. And it's just during emergencies in the absence of a human being that personal initiative is most strained. Now what is the logical deduction? How can we create our own stoppage when and where we want it?" He paused triumphantly - he was beginning to enjoy his role - and answered his own question to forestall the obvious answer on Powell's tongue. "By creating our own emergency."
Powell said, "Mike- you're right."
"Thanks, pal. I knew I'd do it some day."
"All right, and skip the sarcasm. We'll save it for Earth, and preserve it in jars for future long, cold winters. Meanwhile, what emergency can we create?"
"We could flood the mines, if this weren't an airless asteroid."
"A witticism, no doubt," said Powell. "Really, Mike, you'll incapacitate me with laughter. What about a mild cave-in?"
Donovan pursed his lips and said, "O.K. by me."