A different kind of modern double hose.
Below are some pictures from last weekends Boston Sea Rovers rebreather demo.
We got to try 4 different rebreathers, the rEvo, the Dive Rite O2ptima, the Silent Diving Evolution, and the Hollis Prism.
It was a great experience, in particular to be able to try different rebreathers side by side. I have demo/ tried a couple of other different rebreathers, but having the opportunity to try them together was great.
The short class was also very good.
rEvo
Dive Rite O2ptima
Hollis Prism
Silent Diving Evolution
All of the rebreathers underwater:
Note: These are all modern, but I am sure everyone knows that rebreathers do predate open circuit scuba.