Yes, but there's a difference between an under 1 mile section of something and 68 miles beneath a city full of skyscrapers. I wouldn't want something going under my house in London without a big public consultation and some understanding of how it would work, surely.
maybe cities with clogged fire unsafe risk will be next
Sorry, not sure I'm understanding this? Are you saying it could function as an evacuation route in the case of wildfires? That seems like a stretch. Plus, I own a Tesla, somewhat to my embarrassment, but considering the risk involved in electric vehicle fires, which I'm generally comfortable with, I wouldn't particularly want to be in 68 miles of tunnel full of them if things are burning.