If human beings want to survive on the other planets for a long time, they must first find or set up a safe, stable, and long-term shelter. Lunar lava tubes are geological structures on the moon discovered in recent years. They take the form of hollow pipe-shaped caves formed on the surface of the planet by volcanic activity.
Click here for original story, How karst caves can be used as a terrestrial simulation platform to test and design human bases in lunar lava tubes
Source: Phys.org