What to Expect from Your First CCR Certification Course

You have been thinking about it for a while. Maybe a dive buddy switched to a rebreather and came back from a dive raving about the three-hour bottom time. Maybe you watched footage of a diver hovering silently next to a whale shark and thought that is the kind of diving I want to do. Whatever sparked the interest, you are now considering your first CCR certification course, and you want to know what you are getting into.

Good. That curiosity is the first sign you are ready. Here is an honest walkthrough of what the course looks like, what it demands of you, and what you will walk away with.

Prerequisites: What You Need Before You Start

CCR certification builds on your existing diving foundation. You will need at minimum an Open Water and Advanced Open Water certification from a recognized agency (PADI, SSI, TDI, IANTD, or equivalent). Most training centers also expect a minimum number of logged dives, typically 50 to 100, though this varies by agency and instructor. The rationale is straightforward: CCR adds new skills on top of solid open-circuit fundamentals. If your buoyancy, trim, and situational awareness are not already second nature, adding a rebreather to the equation makes everything harder than it needs to be.

You should also be comfortable in the water for extended periods. CCR dives are longer than OC dives, so basic fitness and thermal tolerance matter. There is no requirement to be an athlete, but you should not be someone who regularly ends dives early due to cold or fatigue.

Course Structure: What the Days Look Like

A typical introductory CCR course runs five to seven days of intensive training, though some agencies and instructors spread it over more sessions. The structure generally follows three phases: classroom theory, confined water (pool) sessions, and open water certification dives.

Theory: Understanding Your Life Support System

The classroom component is more involved than any course you have taken before, and for good reason. You are learning to operate a life support system, not just breathe from a tank. Expect to cover:

• Gas physics on CCR. How oxygen and diluent interact in a closed loop. Partial pressures, setpoints, and why maintaining precise ppO2 matters at depth.
• The breathing loop. How exhaled gas travels through counterlungs and the scrubber canister, where CO2 is removed by Sofnolime, and how oxygen is replenished by the controllers.
• Oxygen management. How the dual oxygen controllers on the AP Diving Inspiration (C1 and C2) independently monitor and maintain your ppO2. What happens when C2 detects an issue with C1 and promotes itself to Master.
• Scrubber chemistry and duration. The exothermic reaction that breaks down CO2, how temperature monitoring tracks scrubber life, and how to calculate canister duration for your dive plan.
• Failure scenarios and bailout planning. What can go wrong, how to recognize it, and what to do. This includes cell failures, flooding, CO2 breakthrough, and when to bail out to open circuit.
• Electronics and displays. Reading the 2020 Vision wrist display, interpreting the fiber optic HUD (two greens means normal, any red means check the handset), and understanding battery management.

Pool Sessions: Building Muscle Memory

Before you take the unit into open water, you will spend significant time in confined water. This is where the course starts to feel physical. You will practice:

• Unit assembly and pre-dive checks. Packing the scrubber canister, installing oxygen cells, connecting hoses, running positive and negative pressure tests, and completing the full pre-dive checklist. By the end of the course, this should take you about 15 to 20 minutes.
• Buoyancy and trim on the loop. CCR buoyancy is different from open circuit. The loop volume stays constant as you consume gas, so the buoyancy shifts you are used to from a draining tank do not happen. You learn a new feel.
• Emergency drills. Switching to bailout open circuit, managing a flooded loop, handling cell failures, and responding to HUD warnings. Your instructor will deliberately create failure scenarios and expect you to resolve them calmly.
• Mouthpiece management. Closing the dive/surface valve (DSV) before removing the mouthpiece, switching between CCR and bailout, and clearing the loop after a brief off-unit excursion.

Open Water Dives: Putting It Together

The open water phase typically involves four to six dives, progressively building complexity. Early dives focus on basic rebreather operation at shallow depths: maintaining setpoint, monitoring the HUD, and getting comfortable with the loop. Later dives introduce deeper profiles, longer durations, and task loading where your instructor introduces controlled challenges while you manage the unit.

Do not expect to feel like an expert after these dives. The goal of the certification course is to make you a competent, safe rebreather diver who can continue building experience independently. Proficiency comes with logged hours, not just a certification card.

Feeling Like a Beginner Again

This deserves its own section because it catches almost everyone off guard. You may have 500 dives on open circuit. You may be an instructor. You may be the most experienced diver on the boat every weekend. None of that changes the fact that your first few dives on a rebreather will feel unfamiliar, awkward, and humbling.

The muscle memory you have built over years of OC diving does not directly transfer. Buoyancy responds differently. Your breathing rate has a different relationship with the unit. You are monitoring electronics, checking ppO2, and managing a scrubber in addition to everything you normally do on a dive. It is a lot, and feeling overwhelmed is normal.

The experienced divers who progress fastest are the ones who embrace this beginner mindset rather than fighting it. You are not becoming a worse diver. You are adding an entirely new capability to your diving, and that takes time.

How to Choose a Training Center

Not all CCR training is equal, and your choice of instructor matters significantly. Look for:

• Unit-specific experience. An instructor who teaches and dives the AP Diving Inspiration will know its specific systems, pre-dive procedures, and failure modes intimately. Generic CCR training exists, but unit-specific instruction is more valuable.
• Low student-to-instructor ratio. CCR training demands more attention per student than OC courses. A ratio of 2:1 or 3:1 is ideal.
• Structured post-certification support. The best training centers do not just certify you and send you on your way. They offer mentored dives, check-in sessions, and ongoing guidance as you build hours.
• Training agency affiliation. TDI, PADI, and IANTD all offer well-structured CCR courses. Your instructor should be affiliated with a recognized agency and current on their own certifications.

After Certification: The Journey Continues

Your certification card is a starting point, not a finish line. Most agencies and experienced CCR divers recommend logging 50 to 100 hours on your unit before pursuing advanced training. During this period, your pre-dive routine gets faster, your loop management becomes intuitive, and you start to truly experience the advantages that drew you to CCR in the first place.

One of the strengths of the AP Diving Inspiration platform is its modular upgrade path. You can start with a recreational configuration limited to 20 or 40 meters, then progress through Tec40, Tec60, and Tec100 levels by upgrading your system key. You do not need a new rebreather. The same unit grows with your training and experience.

Silent Diving maintains a network of authorized instructors across the Americas who specialize in AP Diving Inspiration training. Whether you are looking for your initial CCR certification or planning to advance to technical levels, we can connect you with the right instructor for your location and goals.

Browse our instructor network | Contact us to start your journey