1) a human scale device would require 32 m^2 (344 ft^2) surface area according to the designer. 2) filtering out dissolved oxygen from water doesn’t remotely meet the needs of humans underwater. See criticisms of other similar ideas over the years: http://f---nobaddesign.tumblr.com/post/73455162684/spotlight-odd-looking-scuba-mask-turns-you-into-a















