Andrew Sneath, HydroBOB designer and company founder, said: "With minimal training the rider can cruise the underwater world without the need to wear cumbersome dive equipment."
Sneath, a former car factory worker from Bromsgrove, UK, near Birmingham, now based in Florida, added: "Riding HydroBOB is a unique memorable experience of a life time."
The HydroBOB's helmet-like dome contains an air bubble that is continually filled with oxygen from an on-board tank, as reported in Deep-Sea News
The clear acrylic dome gives a 180 degree view and the oxygen tank is big enough to give over an hour's use before resurfacing.
Users don't need goggles, breathing apparatus or a wet suit. They can wear glasses and even talk underwater.
A 12 volt battery stored under the seat allows the scooter to move at two knots. Depth is controlled by a bounce bag, similar to that worn by a scuba diver to control buoyancy.
Users are given a simple ten minute briefing on underwater signalling and how to equalise the pressure in their ears.
has made 350 HydroBOBs - or breathing observation bubbles
- for rental at tourist destinations worldwide, including the Bahamas, Australia and Tenerife in the Canary Islands.