Martian lava tube
Volcanic caverns on Mars, believed to form as a result of fast-moving basaltic lava flows / From Wikipedia, the free encyclopedia
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Martian lava tubes are volcanic caverns on Mars that are believed to form as a result of fast-moving, basaltic lava flows associated with shield volcanism.[1] Lava tubes usually form when the external surface of the lava channels cools more quickly and forms a hardened crust over subsurface lava flows.[2] The flow eventually ceases and drains out of the tube, leaving a conduit-shaped void space which is usually several meters below the surface. Lava tubes are typically associated with extremely fluid pahoehoe lava.[3] Gravity on mars is about 38% that of Earth's, allowing Martian lava tubes to be much larger in comparison.