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My guess is that if they were smashed to bits then the bits would fall upwards towards the mass of the Earth.
I don't remember the exact time, but 42 minutes sounds about right. I also don't remember the exact show, but I think it was about two weeks ago (I listen on the podcast and don't always get to them right away).I thought that maybe the Earth's density would be uneven enough (because of different layers or maybe pockets of different materials) to cause gravity to pull one way or the other.Thanks for the response!
The other thing this Wicki article neglects to mention is the Coriolis force. On many sub-surface trajectories the gravity train would be subject to an apparent sideways force as well; actually just due to moving in a rotating frame of reference.I remember this featured in one Sci-Fi story as a reason why the tunnel had to be stronger on one side than the other!