Very interesting discussion of how to prevent tunnel collapse, with a surprisingly effective demonstration of the technique.
https://youtu.be/xNDppVTVUss
And here's an interesting new technique to drill through rock by melting it with high energy microwaves - this automatically lines the walls of the drill hole with vitrified rock, reonforcing the walls and saving cost of construction.
https://youtu.be/J0Zk6sVxKbI
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