Underwater breather has raised $800k+ despite being scientifically impossible
indiegogo.com
indiegogo.com
This is the modern version of snake oil.
But yes, an independent test would be great.
The relevant questions for me are:
a) What's the actual active surface of the gills?
b) Is the device actively sucking in water or does it rely on immersion alone?
It is pretty easy to fork through thousands of liters per minute (ever cleaned a pool?).
Yes, I am still very skeptical, but I do give people who put their name behind something at least the benefit of the doubt.
If the device in the old video (https://youtu.be/obqxzmmv7uM) is fake, how did it work? Where did the air bubbles come from?
When you do a free dive you pump your lungs full of air and gradually release that air over the course of the dive. A trained swimmer can easily swim without breathing for 50 meters, producing air bubbles all the time. (EDIT: active swimming, aiming for distance. I had to do this when I got my lifeguard certification - IIRC 25m sufficed to qualify, but everyone did 50m).
That video is unfortunately way too short to prove anything.