This article should have started with the fact that the numbers in this are made up. 150 meters below the sea level won’t get you 20 atm of pressure. More impor

This article should have started with the fact that the numbers in this are made up. 150 meters below the sea level won’t get you 20 atm of pressure. More importantly, there is a precise amount of time that you can calculate for how long it’ll take you to reach the center of the earth (I calculated it in undergrad years ago and don’t remember the precise answer but I believe it is on the order of 2 hours), assuming no friction. If there is no friction, you’ll overshoot the center and go clear to the other side of the earth in about 4 hours. More interestingly, you don’t need to go through the center: any section line through the sphere will give you the same exact travel time. In other words if you dig a tunnel from Chicago to Nee York and remove all air, then put a capsule on a maglev track inside it you can travel between the two cities “for free” as far as energy costs in roughly 4 hours. Assuming of course you can manage to dig such a tunnel and keep it serviced.