We might see some new tunneling stuff in our lifetime, if we have any luck:
The Center for Underground at Colorado School of Mines recently was awarded a major contract from the U.S. Defense Advanced Research Projects Agency (DARPA) to design and demonstrate rapid tunneling technology.
https://tunnelingonline.com/center-for-underground-to-design-demonstrate-rapid-tunneling-technology/
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://tunnelingonline.com/center-for-underground-to-design-demonstrate-rapid-tunneling-technology/
Center for Underground to Design, Demonstrate Rapid Tunneling Technology
tunnelingonline.comThe Center for Underground at Colorado School of Mines recently was awarded a contract from DARPA to design and demonstrate rapid tunneling technology.