Respirocytes - Nanotechnology

Respirocytes are artificial mechanical red blood cell and can deliver 236 times more oxygen to the tissues per unit volume than natural red cells. Respirocytes could serve as an in vivo SCUBA. The diver holds his breath for 0.2-4 hours, goes about his business underwater, then surfaces, hyperventilates for 6-12 minutes to recharge, and returns to work below. Respirocytes could permit major new sports records to be achieved. And of course the medical uses.

Eventually we are going to have this kind of nano machines running through our veins.