Always happy to welcome those interested in enjoying the best underground vistas. 😉
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Thanks a lot to the @CMSExperiment colleagues who guided the Portuguese delegation during an excellent visit. It was, as always, a pleasure!
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Not sure there are comprehensive, accurate, and precise estimates.
Assuming "wire" encompasses electrical, optical, gas, and liquid "conveyance", I'd guess something around 10³ to 10⁴ km.
See also controldesign.com/articles/2008/ and symmetrymagazine.org/article/decemb
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