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 carved out the Kaumana lava tubes in Hawaii.

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