Reply to post: it's a 50*kilometre* tunnel.

Japan finds long, deep tunnel on the Moon

John Smith 19 Gold badge
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it's a 50*kilometre* tunnel.

And it's under 10s of metres of rock.

So a) Living room should not be a problem and b) Radiation protection should be more than adequate away from the entrance (which I'm guessing could be quite big as well).

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