My primary interest in CCRs is for filmmaking. At times I may want to record an underwater narration soundtrack for atmosphere. This tilts me towards using the OC version of the Drager Panorama Nova FFM, with an oro/nasal cup rather than a bite mouthpiece.

I've heard various mentions of this kind of thing, mostly concerning CO2 buildup, ranging from "you're dicing with death" to "the risk is grossly over-exaggerated you'll be fine".

I'd be interested to see some discussion on this, preferably from personal experience.

Does the Drager OC mask need any mods for CCR use?

Can anyone suggest a store that carries the OC version in stock? Golem only have the rebreather version.