[cripplecreek]

Another fantasy transport idea I think is cool is the tunnel through the center of the earth and it would require zero power.

The nature of gravity would accelerate you toward the center of the earth and as you passed it you would begin to slow down coming to a stop exactly at the surface on the far side of the planet. 42 minutes from anywhere on the globe.

Its never going to happen for obvious reasons but its still a cool idea.

http://www.damninteresting.com/the-gravity-express/

[calex59]

The nature of gravity would accelerate you toward the center of the earth and as you passed it you would begin to slow down coming to a stop exactly at the surface on the far side of the planet. 42 minutes from anywhere on the globe.

Actually as you neared the center of the earth you would fall slower and slower as gravity weakened, when you got to the exact center your speed would be almost non existent and you would not go past the center, gravity would be pushing you from every direction. No free ride for you. You would be stranded at the center unless you had some sort of power to pull you out, because every direction would be up.