Linking subterranean cities
Hot needle drill, glass walls
https://blogbarley.blogspot.com/2024/09/method-and-apparatus-for-tunneling-by.html Method and apparatus for tunneling by melting
salt atomic reactor drill, elevated safety
Apparatus and method for large tunnel excavation in hard rock https://patents.google.com/patent/US3885832A/en
APPARATUS AND METHOD FOR LARGE TUNNEL EXCAVATION IN HARD ROCK https://patentimages.storage.googleapis.com/8c/2e/99/9580d99120f22c/US3885832.pdf
"A tunneling machine for producing large tunnels in rock by progressive detachment of the tunnel core by thermal melting a boundary kerf into the tunnel face and simultaneously forming an initial tunnel wall support by deflecting the molten materials against the tunnel walls to provide, when solidified, a continuous liner; and fragmenting the tunnel core circumscribed by the kerf by thermal stress fracturing and in which the heat required for such operations is supplied by a compact nuclear reactor. "
.....
Brayton Nuclear Reactor
https://ntrs.nasa.gov/api/citations/20220002293/downloads/E-20018P.pdf
https://ntrs.nasa.gov/api/citations/19860012106/downloads/19860012106.pdf
https://web.mit.edu/16.unified/www/SPRING/propulsion/notes/node27.html
https://energy.sandia.gov/programs/nuclear-energy/advanced-energy-conversion/
Nightwatch and Air Force One continuous flight power source
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