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SACCR diving is all about precision—silent, efficient, and game-changing for exploration. But with great depth comes great responsibility. One of the biggest risks? Hypoxia.
In this demonstration, my PPO2 has dropped below the set point, raising a red flag. However, the PPO2 is still safe to breathe, so to troubleshoot, I check whether my o2 tank is open or closed, and also the functionality of my MAV. Strong situational awareness is a non-negotiable in CCR diving, and a lack of this can lead to hypoxia.
🛑 What is Hypoxia?
Hypoxia happens when there’s not enough oxygen in your breathing loop. Hypoxia can sneak up on you silently—until it’s too late.
⚠️ Why is it Dangerous?
🔻 Rapidly declining blood o2 saturation —often without the diver realizing.
🔻 Subtle warning signs - controlled experiments on military pilots illustrate an inability to follow simple instructions within a couple of minutes of hypoxic breathing, let alone operate a rebreather.
🔻 Symptoms can be subtle: an overwhelming feeling of euphoria and wellbeing, dizziness, confusion… and then blackout.
✅ How to Prevent Hypoxia in CCR Diving
✔️ Replace your oxygen sensors at recommended intervals
✔️ Always monitor your PO₂—trust your sensors, but verify.
✔️ Do proper pre-dive checks—calibrate, test, and verify your readings.
✔️ Train for emergencies with problem solving drills —muscle memory saves lives.
✔️ ALWAYS plan your bailout conservatively —no exceptions.
Hypoxia isn’t forgiving, but awareness, training, and discipline keep you safe. Dive smart, dive safe, and always respect the rebreather.
🔹 Have you ever trained for a hypoxia scenario? What’s your go-to safety check before every CCR dive? Drop your thoughts below! 👇
🎥 @ras.underwater
#CCRdiving #TechnicalDiving #Rebreather #HypoxiaAwareness #DiveSafe #SamehSokar #scubaseekers
@sameh.sokar
