Underground caves do exist on the Moon, radar observations confirm - TechSpot

1. Underground caves do exist on the Moon, radar observations confirm  TechSpot
2. Radar evidence of an accessible cave conduit on the Moon below the Mare Tranquillitatis pit  Nature.com
3. Researchers Find Evidence Of Caves On Moon  The Weather Channel
4. Yes, you could live on the moon. But whatever you do, don’t go into the tunnels...  The Independent
5. Moon cave 'could be base' for future astronauts, scientists say  Sky News