Grail data points to possible lava tubes on the moon

For years, scientists have been hunting for the stable lava tubes that are believed to exist on the moon. A remnant from the moon's past, when it was still volcanically active, these underground channels could very well be an ideal location for lunar colonies someday. Not only would their thick roofs provide naturally shielding from solar radiation, meteoric impacts, and extremes in temperature. They could also be pressurized to create a breathable environment.