AirBuddy

[ondreji]

Friend of mine is running Kickstarter with his "invention": https://www.kickstarter.com/projects/divingeasier/airbuddy-the-ultimate-tankless-dive-system He improved traditional hookah system a lot: smaller and easier to transport (fits into carry-on luggage) and cheaper

Not that much electronic inside (charger + alarm) but definitely more feasible than "Triton, Worlds First Artificial Gills Re-breather"

[m98]

You've got a dot too much in that link.

[Kalidor]

Already exists, 80-90 feet possible with electric or gasoline engine.
http://www.browniesmarinegroup.com/third-lung-diving/
http://www.ebay.com/bhp/brownies-third-lung

Yours can do only 40 feet but is not even half the price
PADI open water still strongly recommended, 40 feet for more than 104 minutes...    after 140 x(   (if you do it wrong)

[kaz911]

and as a diver since I was 16 (so about 30 years... and for about 10 years in the Middle East - 4-5 dives / month) - who owned a variety of dive gear incl a brownies - you do NOT want to dive with a curled hose. It screws up your buoyancy completely when you get to where the hose starts to resist.

 It is also a lot easier for the curled hose to get entangled in things underwater like propeller shafts etc. There are a couple of 12v powered devices for $150'ish with curled hoses and they are a PAIN to use. Fine for surface stuff and where there is no entanglement risk - but close to items that protrude - forget it... Hose is full of air so wants to float - usually (Murphy's law) and it WILL get entangled where there is just the slightest opportunity.

I looked at it and thought - those guys have never dived a lot "attached" ... and went away.