Under the rocks and stones/there is water underground

Looking for lunar caves as a possible place to set up a permanent colony on the Moon got brief mention here recently. One or two space scientists agree:

The Moon appears to possess long, cave-like structures called lava tubes that are similar to ones on Earth. They form when the surface of a stream of lava solidifies and the molten rock inside drains away, leaving a hollow tube of rock.

For decades, engineers and space scientists have discussed the possibility of using these caves as astronaut housing because they are sheltered from space radiation and micrometeorite impacts. But the idea should now be revisited in light of NASA's push to send astronauts back to the Moon, says Austin Mardon of the Antarctic Institute of Canada in Edmonton, Alberta.

At a meeting of the International Lunar Exploration Working Group (ILEWG) in Beijing, China, last week, he argued that robotic probes should be sent to potential lava tubes to see if they are suitable for habitation.

He says erecting pressurised tents inside a cave would be easier and faster than trying to construct a rigid structure on the surface. "Instead of assembling structures that have to be meteorite-proof on the surface, or burying them, you'd have tent-like structures inside these tubes," Mardon told New Scientist. "It's like being cavemen on the Moon."

"It’s a potentially very inviting place to put infrastructure,” agrees Mark Robinson of Northwestern University in Evanston, Illinois, US. He says sections of the lava tubes with roofs still intact appear to be very stable, having survived for 3 billion years or more since their formation.

But he points out that the lava tubes may not be located where NASA would like to send astronauts. For example, the polar regions – which may harbour water ice that could be used to support a lunar base – appear to bear no sign of the ancient lava flows associated with lava tubes.
That's a pity.

As to how NASA intends looking for water on the Moon, it's hoping to try smashing something into it, and sniffing the plume for water. A previous attempt at something similar was not successful, and in fact I would guess that the new attempt may simply be unlucky too, even if some water is around.

Wouldn't a few astronauts with a couple of drills and some explosives stand a much better chance?