We even calculated, how much time it would take to dig down a 1m x 1m hole there. At some point you need to dig upwards. And afterwards, you can just jump into the hole, and pop out on the other side. To avoid being stuck and fall forever, of course you need to jump from a chair, to get some extra speed. And jump head down, fall some 30 minutes, and do a "hop", straddle when you arrived. We ignored heat and air density for the simplicity.