The Financial and Safety Benefits of Closed Circuit Rebreathers 

Investing in a closed circuit rebreather (CCR) can be a game-changer for divers, offering both financial benefits and enhanced diving experiences. However, it’s important to note that CCR diving makes the most sense for those who dive frequently; otherwise, the cost of ownership can outweigh the potential return on investment.

Financial Savings

CCRs recycle exhaled gases, allowing divers to use significantly less gas during dives. This leads to lower costs for tank refills, particularly beneficial for deep or extended dives. For example, for an average open circuit dive with an 18/45 gas mix at 60 meters, you would need around 2,800 litters of 18/45 gas and about 1,200 litters of 50% deco gas. Assuming average prices in Switzerland, this would cost around 150 Swiss francs, provided you blend the gas yourself. If you dive 30 times a year, your total cost would be approximately 4,500 Swiss francs.
In contrast, the same calculation for CCR diving would be around 400 Swiss francs for the 18/45 diluent and oxygen. You would also need to add about 300 Swiss francs for Sofno and approximately 500 Swiss francs for replacing four oxygen sensors annually. This brings the total annual cost for CCR diving to about 1,200 Swiss francs. Thus, while savings can exceed 3,000 Swiss francs a year, it would take over three years to recover the initial investment. For those who dive less frequently, the payback period would be even longer. Additionally, if someone dives deeper than 60 meters, the savings become even more significant.

Ongoing Costs
It's essential to factor in the higher maintenance costs compared to open circuit and this can add to the overall expense, so frequent divers should consider these factors when calculating potential savings.

Increased Preparation
CCR diving requires more preparation than traditional systems. Divers must properly assemble the unit, run thorough pre-dive checks, and take the time to disassemble and disinfect the equipment post-dive. This added complexity demands a commitment to thoroughness and attention to detail, which can be a consideration for those thinking about investing in a CCR.

Enhanced Diving Experiences
CCRs enable longer bottom times and greater depths, opening up a wider array of dive opportunities. Whether for underwater photography, scientific research, or exploration, the increased dive duration and flexibility can lead to richer experiences.

Safety Features
One of the major advantages of CCRs is the reduction of nitrogen narcosis through the use of a Trimix that is tailored for deep diving, which can enhance safety. While CCRs allow for more controlled ascent rates, the risk of decompression sickness is still present, and divers must be vigilant about their ascent profiles. Additionally, for cave dives and deep dives, CCR diving provides more time to solve problems that may arise, allowing divers to address issues calmly and effectively. Regular training and practice are essential to ensure safety and proficiency in CCR diving.

Conclusion
Overall, the return on investment for a CCR goes beyond financial savings. It includes enhanced safety, longer and more enjoyable dives, and a more sustainable approach to diving. For serious divers who frequently engage in deep dives, particularly with Trimix, a CCR can be a compelling choice. However, those who dive less often should weigh the ongoing costs, preparation requirements, and maintenance to determine if the investment is worthwhile.