Bill Stone explores caves. Deep caves. When we speak of design, sometimes we forget some of the most obvious and intricate designs... like that of the earth. Bill Stone explains expeditions into the last "nuggets" of unexplored Earth... expeditions toward the core. With new expeditions that are happening as we speak reaching downwards to 9,000 feet... it is essentially climbing a mountain in the opposite direction. There are millions of caves to be mapped, terminal siphons to dive through, and perilous adventures to undertake. Check out the undiscovered design of the earth: