Argentina to China

Standing out in the hall (not the cold) before class today one of my friends brought up the subject of drilling straight through the center of the Earth and coming out in China. Specifically, he was wondering where you would have to start to end up in China. Being the brilliant, almost-Masters-of-Science Computer scientists that we are, we realized that anywhere in the northern hemisphere would place you in the southern hemisphere on the other side, thus missing China. This did not stop us, being the brilliant almost-blah-blah-blah that we are, from theorizing that perhaps you could tunnel from Cuba and that there is a "Communist connection" between China and Cuba through the middle of the Earth through which citizens of these countries can travel. Not long after this thought, one of the Chinese students came by. We asked him where we would have to start drilling from to end up in China and, without even pausing to think, he replied "Oh, Argentina." We were a little perturbed by how fast he answered, so our interest was piqued. And look what we found. All this time, it was just sitting right below our noses. I figure the travel time is so fast because on the way to the center of the earth you are basically free falling, so you'll go at least terminal velocity, if you're unchecked.