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"The trick is not becoming a writer. The trick is staying a writer. Day after month after year after story after book."
- Harlan Ellison

Bats' Cave  
  A natural cavern used by moon colonists for air storage - and entertainment.  

Most of the stuff written about Bats' Cave gives a wrong impression. It's the air storage tank for the city, just like all the colonies have - the place where the scavenger pumps, deep down, deliver the air until it's needed. We just happen to be lucky enough to have one big enough to fly in. But it never was built, or anything like that; it's just a big volcanic bubble, two miles across, and if it had broken through, way back when, it would have been a crater.
From The Menace From Earth, by Robert Heinlein.
Published by Fantasy House in 1957
Additional resources -

Be sure to learn about Storer-Gulls wings ; colonists used them to fly by flapping their arms, which works in the 1/6th Earth gravity on the Moon.

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Additional resources:
  More Ideas and Technology from The Menace From Earth
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to The Menace From Earth
  Tech news articles related to works by Robert Heinlein

Bats' Cave-related news articles:
  - Is This A 'Skylight' Leading To A Lunar Cave?

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