A high speed elevator for over a minute would put him very deep and it would get very very hot, to the point of it being deadly. A lot of the stories I heard had a commonality of somehow changing the laws of physics. Another element is why they would even try it. A lot of MIC grifter concepts advertise fantasies to the generals and joint chiefs because it sells, and the top brass usually doesn't know shit about science and engineering. The actual implementation of projects (if they ever break ground at all) ends up being more practical. So the question of why, going that deep will quickly have diminishing returns - it's still subject to earthquakes, and nobody has bunker busters like the US does. Extremely deep places would be a nightmare for infrastructure upkeep due to the heat alone. The only time people dig really deep to where it gets hot is because the earth has something in the soil that will bring more money than it cost to get there. A straight train tunnel will only occasionally hit a valuable mineral, so the whole idea of the project will only be cost.

It simply doesn't add up my friend, it provides no advantage to flying out to a bunker, and only presents extreme costs.