I didn’t see the latest version of the movie Total Recall (2012). However, I heard some people talking about the elevator scene.
If you had a tunnel all the way through the Earth and you dropped an object, how long would it take to get to the other side? Yes, I understand that maybe this tunnel didn’t go straight through the center, but I am going to model it that way. How would you calculate this? Here (of course) is a diagram of an elevator going through the Earth (not to scale).