Nitrox is the single most issued specialisation. It’s most useful for repeat dives and on reasonably shallow dives. The most benefit you’ll get is in the 20-30m

Nitrox is the single most issued specialisation. It’s most useful for repeat dives and on reasonably shallow dives. The most benefit you’ll get is in the 20-30m range. As I mostly dive cold waters, I use a max PO2 of 1.4, instead of the 1.6 that some people use. This means that for deep dives (30-40m), I typically end up with EAN28 instead of the more common EAN32. Nitrox is definitely not “extreme diving”, though. It’s just a way to increase your bottom time and reduce your surface interval. Just remember to keep an eye on your CNS%—there’s a limit to how much oxygen your body can safely handle.