Quote: (Originally Posted by
robertfondren)
By virtue of the "fact" that passive addition SCRS require little or no monitoring of loop PO2, and still manage to enhance gas utilization by an engineer-defined ratio (1/7) or greater, are they not at least theoretically the safest form of rebreather?
They do have a prety safe track record, but as with all designs they have their weaknesses. There is no such thing as the perfect Rebreather
My regular dive buddy dives a Recy'01 (RB80 clone). It is a very robust and forgiving rig but it has an Achillea's heel - a particular one way valve.
/GKAM