Yesterday, while emptying the new dirt from our the compost bin and pile to fill in some of the garden beds, I remembered my brother's hole to China. When we were kids, he spent a bit of time working hole in the side yard with the aim of tunneling through to the other side of the world. It ended up being only two feet or so deep, but had he made it through to the other side, it would have been a bit of a surprise where he'd've ended up.
According to Zefrank's "If the Earth Were a Sandwich" tool, directly opposite our old sideyard is a spot in the Indian Ocean, about 1,500 miles due west of Cervantes, Western Australia. (Via Keywords)