If they were to drill a hole through the center of the earth all the way to the other side?

Gravity would probably be close to nuetral, since both sides would cancel each other out, but even if there was gravity, it would'nt stop anyone from moving, after all, gravity would be strongest on the surface of the Earth, and we can move around okay. So it would weaken at we went down into the Earth, become nuetral and then start getting stronger as we neared the other side.

And we would be toast anyway, or look like roasted marshmellows.

As for your hole, if you do not get to the middle in the next 200 years, then you should stop digging.

well, the earth would explode firstly. but lets say that doesn't happen. The person would continue to accelerate until they reach the core, then they'd rocket towards the other side slowly loosing momentum. They'd make it just to the other side before falling back in (depending on the friction)

That and also melt. But mostly find all of the kids trying to dig their way to China

no, you could purchase a rather large gold chain and put it through the holes and wear it as a bead on a chain around your neck...

They would burn up once they reached a close enough spot to the core

You understand that there is molten lava in the center of te earth right...?

ive wondered the same thing!lol

theyd proboly die form the pressure