Can you answer it ??!

if you drilled a hole through the earth from one end to the other and jumped in. would you fall all the way through to the other side or would you fall down half and climb up other half? 

I know the answer. I solved this task when I learned at school,

First you will fall down with the gravitational acceleration as deep as the centre of the planet. After that the gravitational acceleration will become negative so your speed will slow down. When your reach the other end of the hole, you should quickly seize the brink of the hole with your both hands because if you do not do it you will fall down again.

I agree with MsX 

It is technical impossible to drill a hole  like that, anyway…you would die and desintegrate much metres before to reach the center of the erath: pressure, temperature…

thinking in teoric physics laws, is what MSx said. 

I agree with dabbid. It seems impossible, but I like your idea very much ;)