Here you find another beautifull unit. It is the LAMA Scanuba.
Semi Closed Automatic Nitrox Underwater Breathing Aparatus.
It is surface supplied and has interesting techniques!
Check this out:
http://www.therebreathersite.nl/SemiClosed%20Rebreathers/France/lama_scanuba.htm
I would like to thank Yves le Masson for his kind cooperation to this article!
Janwillem Bech
http://www.therebreathersite.nl