http://www.dailymail.co.uk/sciencetech/article-4996024/Huge-cave-moon-house-astronauts-Japan-scientists.html

Is this the perfect spot for a lunar colony? Japan’s space agency uncovers a 30 mile-long cavern on the moon that could house astronauts and protect them from deadly radiation

A huge moon cave that could one day shelter astronauts from dangerous radiation and wild temperature swings has been discovered.
Data taken from Japan’s Selene lunar orbiter has confirmed the existence of the 31 mile (50 km) long and 330 foot (100 metre) wide cavern.
Experts from the country’s space agency believe it is a lava tube created by volcanic activity about 3.5 billion years ago.

cool. A mooncave.

Big cave.

Didn’t google maps do a moon map
https://www.cbsnews.com/news/new-google-maps-feature-lets-you-go-to-space/

https://www.google.com/maps/@21.8301942,-176.0344058,22048802m/data=!3m1!1e3

https://www.google.com/moon/

No search feature yet, that must be still in the works

but you can zoom in

Marius Hills is somewhere in Oceanus Procellarum

https://www.google.com/maps/space/moon/@17.756756,-61.1724616,2850053m/data=!3m1!1e3

> Is this the perfect spot for a lunar colony?

Possibly. Possibly not.

The geology of Hadley Rille is similar, but the Apollo 15 rover wasn’t allowed into it for fear that the rock might collapse.

I personally think that a big colony could exist in the lunar cavern, and that it could be pumped full of enough oxygen to survive on, eg. a pressure of 0.15 atmospheres. Underground is always far easier for life to survive than above ground – it’s only chlorophyll that forces life on Earth onto the surface.

https://apod.nasa.gov/apod/astropix.html

Could humans live beneath the surface of the Moon? This intriguing possibility was bolstered in 2009 when Japan’s Moon-orbiting SELENE spacecraft imaged a curious hole beneath the Marius Hills region on the Moon, possibly a skylight to an underground lava tube. Follow-up observations by NASA’s Lunar Reconnaissance Orbiter (LRO) indicated that the Marius Hills Hole (MHH) visually extends down nearly 100 meters and is several hundred meters wide. Most recently, ground penetrating radar data from SELENE has been re-analyzed to reveal a series of intriguing second echoes — indicators that the extensive lava tubes exist under Marius Hills might extend down even kilometers and be large enough to house cities. Such tubes could shelter a future Moon colony from large temperature swings, micro-meteor impacts, and harmful solar radiation. Potentially, underground lava tubes might even be sealed to contain breathable air. These lava tubes likely formed when lunar volcanos were active billions of years ago. Pictured, the surface of Marius Hills region was captured in the 1960s by NASA’s Lunar Orbiter 2 mission, while an inset image of the MHH is shown from NASA’s continuing LRO. Several volcanic domes are visible, while Marius Crater is visible on the upper right.