The big hollows on the surface of the moon
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The Hollow Moon hypothesis, or Spaceship Moon hypothesis, proposes that Earth's Moon is either wholly hollow or otherwise contains a substantial interior space. No scientific evidence exists to support the idea; seismic observations and other data collected since spacecraft began to orbit or land on the Moon indicate that it has a thin crust, extensive mantle and small, dense core, although overall it is much less dense than Earth.
The Hollow Moon concept is similar to the better-known Hollow Earth hypothesis, which was a recurring plot device in pre-spaceflight science fiction. The first discussion of a hollow Earth was by scientist Edmond Halley in 1692, while the first publication to mention a hollow Moon was not until H. G. Wells' 1901 novel The First Men in the Moon.