RE:Update on tunneling at Petra PYR also abandoned the tunneling offering as per Peter a while back on a Agoracom Q&A I think.
And that too did not have to be press released as it was just a R&D offering.
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Louis1000000 wrote: The following article describes the technology Petra is now using for tunneling. It is high heat and gas but at a lower temperature than what a plasma torch would operate. Petra abandoned plasma torches because of the lava flow it creates. Wonder if Pyrogenesis has any doing in the new approach... As it is a low temperature 'Plasma' torch of sort... Interesting to note that one of the co-founder of Tesla has a role in the new tech development
https://www.wired.com/story/new-tech-cuts-rock-without-grinding-it/