Curious Case of the Martian Hole: Volcanic Mystery

Martian hole's significance lies not just in its form but also in what it might reveal. Could these pits lead to vast cave networks below the surface? These potential caverns could offer shelter for future human explorers and hold clues about Mars' ancient past, including the possibility of past microbial life.

[@Indygo9]

Interesting. that's very deep. There is water underground too. something miles thick and the size of Arizona around the equator was it?