Method and apparatus for tunneling by melting
A machine and method for drilling bore holes and tunnels by melting in which a housing is provided for supporting a heat source and a heated end portion and in which the necessary melting heat is delivered to the walls of the end portion at a rate sufficient to melt rock and during operation of which the molten material may be disposed adjacent the boring zone in cracks in the rock and as a vitreous wall lining of the tunnel so formed. The heat source can be electrical or nuclear but for deep drilling is preferably a nuclear reactor.
https://patents.google.com/patent/US3693731A/en
https://patents.google.com/patent/US3115194A/en
https://patents.google.com/patent/US3885832A/en
https://inis.iaea.org/collection/NCLCollectionStore/_Public/03/031/3031835.pdf
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