Caves of the Moon
jeno passes along this excerpt from New Scientist:
"A deep hole on the moon that could open into a vast underground tunnel has been found for the first time. The discovery strengthens evidence for subsurface, lava-carved channels that could shield future human colonists from space radiation and other hazards. ... The hole measures 65 meters across, and based on images taken at a variety of sun angles, the hole is thought to extend down at least 80 meters. It sits in the middle of a rille, suggesting the hole leads into a lava tube as wide as 370 meters across."
Sure but the same could happen to your home. Events of that type are pretty rare and hell, if something can smash through solid rock it'll probably smash through the ceiling of your surface moonbase too.
Justice is the sheep getting arrested while an impartial judge declares the vote void.