lunar lava tube

From Underfoot Expounder

Q2582077

sub-surface tunnel on the Moon, believed to have formed during basaltic lava flows

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An underground lunar base within a 1000-meter diameter lava tunnel 2024An underground lunar base within a 1000-meter diameter lava tunnel 2024
An underground lunar base within a 1000-meter diameter lava tunnel 2024An underground lunar base within a 1000-meter diameter lava tunnel 2024
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