Are underground cities 🌃 the future ??
(youtu.be)
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This video kid is purely annoying, big time, and stupid. As for the concept, no, they are not the future, in so many ways.
The excavation alone would blow out any construction budget
not really. DUMBs are done with laser arrays that can melt the rock into lava which is then moved wherever.
even if one doesn't believe in DUMB's, the JPL patent for the laser array can be verified.