Suppose somehow a ten-foot wide hole was bored down through the Earth's center and clear thru to the surface.?
What would you experience if you were to jump into this bottomless pit? What would an observer with the tools to monitor your movement observe? Where is it, that you guess, your movement would come to rest? You may pretend to be impervious to extreme heat and any friction from bumping happenstance into the sides of the tunnel now and then. Presume the tunnel is tenacious in keeping itself straight and clear. Thank you.