Closed circuit rebreather (CCR) courses and SCUBA diving with a CCR.
Dream about exploring the underwater world longer or deeper? Then the CCR rebreather courses are for you. The potential advantage of CCR rebreathers will make you stay longer underwater with more no-decompression bottom times or less deco thaan open circuit (OC), you will be able to dive deeper with less gas (which is a lot cheaper with a trimix), and you will be able to get up really close to marine life as you will not make any bubbles and dive silently underwater.
This is where “The Silent World” (from Jacques-Yves Cousteau) take all its meaning, because on a close circuit rebreather (CCR) you won’t make any bubble noises.
During a dive on a rebreather CCR, you will not alarm the sea life around. Fishes will think that you are part of the marine life. The CCR is very popular amoung the professional underwater photographers and videographers as they are able to capture and record more closely to the sea creatures. Silent diving is a big plus aside from longer bottom time.
Diving with a CCR will give you more dive time. Capable of extended times when open circuit divers need to end their dives because they have reached their minimum gas limits, you will get to enjoy and dive longer, even for several hours, with only a 3 liters tank (0.8 gallon cylinder).
Because you are breathing in a loop and constantly recycling the exhausted gas, you are breathing a warm and humidified gas, which is a more comfortable than the dry and cold gas from the usual open circuit SCUBA gear. You can now dive without having that cotton-mouth feeling, and chilling in cold water, anymore.
OK a rebreather is nice, but let's talk numbers!
One of the great advantages of the CCR rebreathers, is that they have extreme low gas use which means there is no need for an expensive amount of helium for your trimix dives.
The average consomption of a diluent (your trimix gas) for a 50 meters (165 feet) deep dive and 1h30 mn total time dive, is only 50 bars on a 3 liters cylinder (725 psi on a 0.8 gal tank). So all you have to do is to enjoy your underwater exploration.
But the most important during this dive "example", is that you will have less decompression time than the same profile with an open circuit gear, because on a CCR you are at a constant PPO2 during all the dive, at whatever depth you are!