Post #3540164

"Holes" by #XKCD comic - Comparison of various mostly-artificial holes in the ground and their depths: tunnels, mines and bore holes compared by depth to the Mariana Trench at the deepest spot in the Pacific Ocean. The deepest parking garage in the world is under the Sydney Opera House. The mouseover text prods readers toward the crystal caves in Mexico. Also some #oops markers where digging projects didn't go well. https://xkcd.com/3266/ #geology #mining #science #entertainment #humor