CPR and Rescue for Freediver Blackouts: What Every Buddy Needs to Know

Shallow water blackout is the leading cause of freediving death. It happens fast, with no warning, and almost always within the last 15 feet of ascent or right at the surface. The diver doesn't choose it - the body simply runs out of oxygen. The window from blackout to brain damage is roughly 2-4 minutes. Whether your buddy lives or dies depends on whether you can recognize what is happening and act in seconds. This guide is the rescue protocol every diver should know cold. It does not replace certified training, but it is the baseline.

Recognizing a Blackout

Diver stops kicking on ascent. Body goes limp. Head not turned to surface. Air bubbles release from mouth. Diver reaches surface unconscious or unaware. After surfacing, the diver may convulse, eyes roll back, body shakes (this is loss of motor control or LMC, also called samba). Diver appears confused, can't speak, looks pale. Any of these is an emergency.

The One-Up-One-Down Buddy Protocol

One diver on the surface, watching, every single dive. The buddy must be within reach when the diving partner surfaces. Watch the entire dive - if your buddy doesn't surface within their expected time window, dive to assist immediately. This protocol is the single most important rule in freediving. Most blackout fatalities happened because the buddy was not actively watching.

The Rescue Procedure

Step 1 - React: see victim in trouble, reach immediately, calm action saves life. Step 2 - Get them to surface: if unconscious underwater, drag to surface immediately by mask strap or weight belt; maintain airway by tilting head back. Step 3 - At the surface: drop their weight belt to establish positive buoyancy; tilt head back; mouth out of water; remove their mask if it's filling with water.

Step 4 - Blow-Tap-Talk: blow on their face; tap their cheek; loud verbal command "BREATHE! BREATHE!" This stimulus often triggers spontaneous breathing in semi-conscious victims. Step 5 - Rescue Breaths if not breathing: tilt head back, lift chin, pinch nose, give 2 rescue breaths into their mouth, watch for chest rise. Step 6 - Get to boat or shore: give breaths every 5-10 seconds during transport; remove from water as soon as safely possible. CPR cannot effectively be done in water.

Step 7 - CPR if no pulse and not breathing: 30 chest compressions, 2 breaths cycle. Compressions 2 inches deep, 100-120 per minute. Continue until: victim breathes, professional help arrives, or you are physically unable. Step 8 - Get medical help: call 911, Coast Guard at sea (Channel 16 VHF Mayday), keep performing CPR while waiting. Every blackout victim needs hospital evaluation even if they appear to recover - lung damage and cerebral hypoxia are possible.

Loss of Motor Control (LMC / Samba)

LMC is the milder cousin of full blackout. Diver is conscious but body shakes, no muscle control. Often a precursor to full blackout. Hold them at the surface, support their breathing, do not let them go under. Recovery usually 30-60 seconds. Still requires medical evaluation.

Key Principles

Speed matters - every second counts. Get to surface FIRST, then assess. Drop their weights early to keep them afloat. Stay calm - adrenaline tunnels your vision. Don't try CPR in water (ineffective and risks both divers).

Equipment That Helps

Whistle on dive belt for surface signaling. Visible dive flag or torpedo float for signaling. Marine VHF radio for offshore diving. Cell phone in dry bag. AED if available on the boat. Emergency O2 kit and be sure you know how to use it. Tested rescue gear before every trip.

Find these at Amazon.com

Prevention

Never dive alone.

Never hyperventilate. Respect surface intervals (3x your dive time minimum). Don't push past your breath-hold threshold. Stop if you feel any urge to breathe in the last 20 feet. Stay relaxed throughout the dive. The blackout you prevent is the rescue you don't have to perform.

Get Real Training

Take a certified freediving course (AIDA, PADI Freediver, Molchanovs, FII, SSI Freediver). They include hands-on rescue practice in pool and water. Practice rescue drills with your buddy as part of regular routine, not first-time skill. Every diver should be able to perform this rescue. Practice it. Talk about it. Make it normal.

Freediving fatalities are almost always preventable with proper buddy protocol and rescue knowledge. This guide is a baseline, not a substitute. If you have not had hands-on rescue training, get it before your next dive.

Check real-time California dive conditions at conditions.spearfactor.com.

For more on freediving safety, visit freedivingsafety.com.

Photo credits: Shallow Water Blackout educational image by Ex nihil, via Wikimedia Commons (CC BY-SA 3.0). Cardiopulmonary Resuscitation Adult by US Army Corps of Engineers, Illinois Waterway Visitor Center, via Wikimedia Commons (Public Domain). Both images are educational depictions used to support water-safety instruction.