halcyon rebreather

[DRE]

Rebreathers and DIR do coexist, but only for the most extreme types of diving. For example, in Wakulla any setup dive 15,000ft or less is mostly done on OC - anything farther than that and the Halcyon rebreather comes into play. Reason being that they use it as a gas management tool. In case of an emergency, or if they think anyhting might be wrong the entire dive can be completed on OC. Also, for the Britannic expedition (dives in the 400ft range on a 850ft wreck) all dives were done on OC.
Do you really think that if a rebreather had any advantages in terms of decompression these guys wouldn't be using it?
In reality, 99% of divers owning a rebreather do not NEED one to do their dives. Their decisions are based on other factors, such as perceived benefits or being attracted to technology - all at a much higher risk though (Yeah I know Divermole...)