Gear
Backmount, sidemount or CCR?
The platform you choose shapes almost every other decision about your diving. What each one does well, where each one struggles, and how divers choose.
Section
CCR
Closed-circuit rebreathers
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Safety
Gas density: the limit you don't plan for
Most divers plan for oxygen and narcosis. Fewer plan for how thick their gas is at depth. Research published in 2016 suggests they should, especially on rebreathers.
History
The rebreather's long road
Rebreathers came before scuba. It took more than a century for them to become everyday kit for technical divers. A short history.