I got a question...

i think that if someone was to fall through the hole they might get stuck in the middle but since gravity is at its strongest at the earths core that person would be crushed in an instant

Ok, let\'s say this then.  What if you were to throw a highly concentrated metal ball of sorts down the hole?  What would happen to it, assuming it doesn\'t melt?

It\'d stop in the middle.

Gravity is the law that if any 2 objects are floating & free of resistance they will be atracted to each other.  I\'m not sure if the gravity is any stronger at the center of the earth, but the lack of centrifugal force is what makes it seem like there\'s more gravity. (I\'m not positive on any of this)

So I think the Metal Ball would go to the center and then stick to the side of the tube.