the usefulness of an underwater scooter

There is still little time reserved for a few tech and especially underground divers, the use of underwater scooters is tending to spread. The use of new technologies for batteries and motors reduce their weight while maintaining autonomy. Sutout useful for tech divers, to give them autonomy, and prevent them from making efforts during deep and long dives, they can also be very interesting on leisure dives in PMT on the surface to discover the funds under -marines:  http://www.lac-du-bourget.fr/public/scooter-sous-marin-dpv-deep-ccr-tartiflette-team.jpg