We can already breathe underwater. But it requires that we strap a heavy tank on our backs and go through training. The Triton Underwater Artificial Gills are light, arrive assembled, and require no training. If they actually work... well that's a whole other conversation. According to the maker, the Triton setup extracts oxygen from the water and a micro compressor takes the oxygen and stores it — supposedly allowing you to breathe underwater for up to 45 minutes. Perfect for your commute when the rising sea levels finally make cabs and Uber extinct.