I think the parent comment exposes the obvious flaw of using plasma to drill: Drilling with diamond bits uses fluid, which is uncompressible. Drilling with pla

I think the parent comment exposes the obvious flaw of using plasma to drill: Drilling with diamond bits uses fluid, which is uncompressible. Drilling with plasma uses gas, which is compressible. No matter how thick the obsidian layer get, there is a critical pressure differential between outside and inside and it will crack and collapse.