The Kola Superdeep Borehole holds the record for being the deepest artificial point on Earth ... man made hole ever. Despite going so deep, the borehole was eventually sealed for various reasons ...

It's currently the deepest man-made hole on Earth, reaching a dizzying 40,230 ... don't panic: it's sealed up with a rusty metal lid. Phew. Devil's Sinkhole is a massive cavern near Rocksprings ...