Tried this once.  Only got down about five feet.  Could have done better with a backhoe, I suppose.  Thanks to ze Frank’s “if the earth were a sandwich” project, I discovered how lucky I was.  My hole would not have hit China, not if I kept on a steady course straight through the center of the earth.  No, my hole would have hit the Indian Ocean and drained it into my backyard in Monona and if you think my mom was pissed with the initial excavation, imagine how annoyed she would have been with the entire Indian Ocean rushing in and flooding out her zinnias.

If you want to dig a hole through the center of the earth and come out in China, it would behoove you to start digging in Argentina or someplace.  ze Frank has a tool to help you figure this out.

(If you live where the Amazon rain forest used to grow, maybe you could get the Sultan of Brunei to fund your excavation).