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That's amazing tech. Would lasers not be better suited for underground cutting for tunnels?

Lasers would probably need a lot of energy to cut that much material.

Can somebody do a quick analysis how much it would probably cost using conventional/water/lasers?

Do we even have the capacity to create sustained lasers with sufficient energy output to cut through solid rock?

Actually they would vaporise the material, not cut it. So yeah, a lot of energy needed !