that's cool but would suck if battery went dead lol . like a fish out of water
rebreathers work by using filters with soda lime in them to absorb co2 from your exhaled breath and you rebreath the air with less co2. this claims to split the H2O molecule to Hydrogen and O2 and have it ready to breath in all while being compact to wear on your head. AFAIK.
Guys, this is a concept idea and non-functional. Cool design, needs a whole lot more tech to be put into practice.