Looking for a way to bring short, underwater adventures to people without the related costs and problems of using full SCUBA gear, David Hallamore has introduced the Scorkl Handheld Diving Tank ($200), a small air canister that can replace the snorkel for shallow water exploration.
The Scorkl is equipped with an always-on, breathe-on-demand, balanced single stage regulator. The attached pressure gauge keeps up with how much air is left in the small cannister which, when pumped up to 3,000 psi, can provide up to 10 minutes of underwater time. The unique feature of the Scorkl is the accompanying hand pump with which you can refill the bottle yourself. There is also an adapter that will allow filling from a regulation SCUBA tank.
The Scorkl is not a toy and, despite advertising claims, should not be used without having previously obtained diving training to familiarize yourself with the problems compressed gas presents as well as decompression principles for a safe swim and return to the surface.