schwit1 writes: Small pits in a large crater on the Moon's North Pole could be "skylights" leading down to an underground network of lava tubes – tubes holding hidden water on Earth's nearest neighbour, according to new research.
There's no lava in them now of course, though that's originally how the tubes formed in the Moon's fiery past. But they could indicate easy access to a water source if we ever decide to develop a Moon base sometime in the future.