A newly discovered moon tunnel could be the perfect place for a colony, scientists say

At the close of the Apollo age, a year before the final moonwalk in 1972, a NASA researcher argued that vast tunnels lie beneath the lunar surface.

There was good reason to think so. Lava from ancient volcanoes might have bored miles-long voids beneath the moon's surface, just as volcanoes formed the Kaumana lava tubes in Hawaii.