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Is there a good reason not to make the base mostly under-ground, if you have the technology to dig it up?

Mostly that digging giant holes in the ground is harder than it looks.

Especially since we don't have any practical experience digging tunnels in mars gravity - or even know exactly how it impacts geology. Would be a shame to lug a bunch of (extremely heavy) equipment out there and have the tunnels turn out unstable.

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