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).
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).