So this is cool news. Israeli inventor
Alon Bodner has apparently developed a diving system that will replace scuba tanks as we know them. Essentially, he has studied how fish remove oxygen from water and produced a prototype that will allow people to do the same. This will allow people to
breathe underwater at up to a 200m depth
without using oxygen tanks. He's working with several scuba companies and has recieved money from the Israeli military to continue his work. Check it out
here and the official link
here. After all, "Water is the essence of wetness, wetness is the essence of beauty."