Freediving Rescue: How to Save a Blacked Out Diver

A freediving blackout is not dramatic. There is no thrashing, no shout, no signal. A diver who was fine two seconds ago goes quiet, the eyes lose focus, and the body sinks or slumps. If a trained buddy is within arm's reach and does the right things in the right order, the usual outcome is a diver who is breathing again within seconds and confused about what just happened. If nobody is there, the same event is fatal. That difference is the entire reason the freediving buddy system exists.

This page walks through the rescue sequence for a surface blackout and for a blackout at depth, explains blow tap talk properly, and separates a samba from a full blackout. Read it as preparation for training, not as a substitute for it. Every serious agency, AIDA, SSI and PADI included, puts hands on rescue practice in the water at entry level for exactly this reason. You cannot learn to hold someone's airway clear in a two foot chop by reading about it.

It also helps to understand what causes the event you are responding to. Hypoxic blackout in freediving is a predictable physiological endpoint, not bad luck, and the mechanism is covered in detail on shallow water blackout. Understanding why the last few metres of ascent are the danger zone is what makes the positioning advice later on this page make sense.

Most blackouts announce themselves a second or two early if you are actually watching. The safety diver's job is not to react to a limp body, it is to notice the change before that. Learn what a normal ascent looks like for your buddy so you can spot the abnormal one.

Warning signs during ascent

• Fin kick that becomes irregular, weak, or stops entirely
• Arms going slack or drifting away from the body
• Head tipping back or the body starting to arch
• A sudden change in speed, either slowing to a stall or an uncontrolled float
• Eyes open but unfocused, or eyes rolling upward
• Bubbles released from the mouth or nose late in the ascent

Warning signs at the surface

• Failure to give the OK signal within a few seconds of surfacing
• Recovery breaths that are shallow, gasping, or absent
• A vacant stare, a slow blink, or no eye contact
• Fine tremor in the hands, jaw, or shoulders
• Slurred or nonsensical speech, or saying I am OK while looking clearly not OK
• The chin drifting toward the water

The protocol most freedivers use is a verbal and visual OK within a set number of seconds after surfacing. If it does not come, you treat it as an emergency and act. Do not wait politely to see if they were just slow. The standard freediving hand signals exist so this check is unambiguous, and a signal that is late, sloppy, or one handed when it should be two counts as a failed check.

This is the core skill. A blacked out freediver is normally in laryngospasm at first, meaning the airway seals itself shut and water does not enter the lungs. That protective reflex buys you time, but it fades as hypoxia deepens. Your entire priority is keeping the face out of the water so that when breathing restarts, air goes in and water does not.

1. 01 —Get to the diver and get a grip. Approach from behind or the side. Support the back of the head and neck with one hand and the chin or shoulder with the other. Use your own buoyancy and your float or the line to hold position.
2. 02 —Bring the airway out of the water and keep it there. Roll the face clear of the surface, tilt the head slightly back, and hold the mouth and nose above the waterline. This is the one thing that must never slip while you do everything else.
3. 03 —Remove the mask or goggles. Nose clip off as well. Clearing the face gives you access for stimulation and lets you see colour and eye response.
4. 04 —Blow tap talk. Blow across the eyes and face, tap the cheek, say their name loudly and calmly. Repeat for around fifteen seconds while keeping the airway clear.
5. 05 —Watch for breathing. Look at the chest, feel for air at the mouth, listen. A first breath is often a sharp gasp followed by normal breathing.
6. 06 —If no breathing after roughly fifteen seconds, give rescue breaths if you are trained to do so. Two slow breaths, mouth to mouth or mouth to nose with the airway held clear, then reassess.
7. 07 —Call for help. Shout to the boat, signal the surface crew, and get someone dialling emergency services. Do this in parallel if there is another person present, not after.
8. 08 —Move the diver to the boat, platform, or shore while maintaining the airway. Support the head throughout the tow and the lift.
9. 09 —Once on a firm surface, reassess breathing and pulse. Begin CPR if there is no breathing and no pulse, and continue until professional help arrives.
10. 10 —Even if they recover fully in seconds, end the session and get medical evaluation. Water may have entered the lungs and problems can appear hours later.

Notice how much of this depends on already being close enough to reach the diver in a second or two. That is a positioning problem, not a reaction speed problem, and it is why solo diving turns a survivable event into a fatal one. The broader risk picture is laid out in is freediving dangerous, and the short version is that the sport's safety record depends almost entirely on whether someone qualified was watching.

Blow tap talk is the standard stimulation sequence taught across freediving agencies. It sounds almost too simple to matter, which is why people rush it or skip straight to rescue breaths. In practice it is the step that resolves the large majority of short hypoxic blackouts, and it works because the face is unusually well wired for exactly this.

Blow

A firm, gentle stream of air across the eyes and forehead. Cool air moving over the face stimulates the trigeminal nerve, the same pathway involved in the mammalian dive response, and provokes a reflexive gasp or blink.

Tap

Light, quick taps on the cheek. Touch on the face adds a second stream of sensory input on the same nerve pathway. Light means light. This is a tap, not a slap, and never a shake.

Talk

Their name, loudly, clearly, calmly, repeated. Auditory input reaches a hypoxic brain that is already recovering as oxygen returns, and hearing a familiar name is one of the most reliable triggers for the first breath.

The reason it works within seconds is that a short blackout is a brief oxygen shortfall in the brain, not a stopped heart. The heart is usually still beating, blood oxygen begins to rise the moment ascent finishes and the diver is at the surface, and the brain only needs a small nudge to resume automatic breathing. The stimulation supplies that nudge. The rescuer's calm voice also matters for the moments afterward, because a diver who comes round confused and inhaling seawater is a second emergency.

Fifteen seconds is the commonly taught limit before escalating to rescue breaths. Count it out loud so the timing is real rather than a guess. Under stress, five seconds feels like thirty.

This is harder, more dangerous for the rescuer, and firmly in the territory where formal training is not optional. A diver who blacks out below the surface has to be brought up by someone else, and that person has to manage their own breath hold, their own ascent, and another human body at the same time.

1. 01 —Reach them. Descend to the diver directly and get a positive hold, normally under the arm or across the chest and back, with your other hand available for the face.
2. 02 —Secure the airway. Seal the mouth and nose with your hand, or press the chin toward the chest to keep the mouth closed. This prevents water entering during the ascent.
3. 03 —Start a controlled ascent. Use your fins and your own buoyancy plus theirs. Keep the diver's head positioned so the face does not scrape or roll. Do not panic kick, and do not exhaust yourself, because a second unconscious diver is a catastrophe.
4. 04 —Use the line or the lanyard if there is one. Pulling on a rigged line is more efficient than finning with a load and gives you a fixed reference to the surface.
5. 05 —On the surface, release the airway seal immediately, roll the face clear, and switch to the surface protocol above. Remove their mask, then blow tap talk.
6. 06 —Signal the surface crew before you start ascending if you can, or the moment you break the surface if you cannot.

This is precisely the skill set that structured courses build in stages, with an instructor watching each attempt and correcting the grip and the airway seal. If you have never rehearsed a rescue from depth, you do not have this skill yet. Reviewing the syllabus differences on the best freediving certification page will show you which agency levels introduce rescue from what depth.

Samba is the common name for loss of motor control, the shaking or jerking that happens when the brain is short of oxygen but has not shut down. It looks alarming and it is a genuine warning sign, but the diver is still conscious or partly conscious. Full blackout is complete loss of consciousness with no response to voice or touch.

The practical response is nearly identical in the first moments, and that is deliberate. Support the head, hold the face clear, talk. The difference is that a samba diver may fight your grip or try to reassure you while still visibly shaking, and you should ignore that and keep holding them. A samba can progress to a blackout in seconds. Treat it as the same emergency until they are breathing normally, speaking clearly, and holding the float on their own. The mechanism and the recovery pattern are covered in more detail in the article on freediving samba.

The rule taught almost universally is that the safety diver stays face to face with the surfacing diver for at least thirty seconds after they arrive, watching them breathe. This is not a formality. The riskiest moment in a breath hold dive is the last part of the ascent and the first moments at the surface.

The physiology behind it is straightforward. During ascent, ambient pressure falls, the partial pressure of oxygen in the lungs falls with it, and oxygen can move from the blood back into the lungs rather than into the tissue. A diver who felt fine at 15m can lose consciousness at 3m or at the surface. The full explanation lives in the shallow water blackout article, but the operational takeaway is simple. Surfacing is not the end of the dive.

What the watch window looks like in practice

• Safety stays within arm's reach, positioned in front of the diver
• Diver keeps one hand on the float or line at all times
• Diver removes their mask or lifts it, so the face is visible
• Diver gives a clear verbal I am OK plus the hand signal
• Safety counts the thirty seconds out loud or watches a timer
• Nobody starts their own breathe up or descent until the window closes

One up one down means exactly one diver in the water going down at a time while the other stays at the surface, rested, ready, and watching. It exists because a blackout is silent and because a rescuer needs full oxygen reserves. Two divers descending together is not buddy diving, it is two people taking turns being unattended.

For deeper dives, the safety diver does not simply wait at the surface. They descend to meet the diver on the way up, typically in the last 10m, so they are already alongside through the highest risk part of the ascent. Meeting the diver at around 10m and escorting them to the surface means that if consciousness goes at 5m, the rescuer is already there with a hand available rather than fifteen metres and several seconds away.

Safety diver checklist

• Fully recovered from your own dive before your buddy descends
• Know their target depth and their expected total time before they go
• Agree the countdown, the dive time, and the meeting depth out loud
• Track the time, and start your descent so you meet them, not chase them
• Descend facing up so you see them coming, and stay slightly below and to the side
• Escort at their speed, do not tow or hurry them
• Face them at the surface and hold the thirty second window
• Keep the float, line, and any rescue equipment within reach

Positioning discipline is not a deep water only concern. Pool sessions produce blackouts too, often in dynamic apnea where divers push distance in shallow water and the safety walks the poolside instead of swimming alongside. The conventions for that setting are covered in the guide to pool training, and the underlying principle does not change: someone qualified is within reach, watching the face, every single time.

Most of the ways a rescue goes wrong come from good intentions applied in the wrong order. These are the errors instructors correct most often.

Do not shake them

Shaking does nothing useful, risks the neck and spine, and makes it far harder to keep the face clear of the water. Blow tap talk is stimulation. Shaking is not.

Do not attempt chest compressions in the water

They cannot generate meaningful circulation without a firm surface behind the chest, and attempting them wastes the seconds you need to get the diver out. Compressions start on the boat or the shore.

Do not leave the diver alone

Not to fetch equipment, not to get the boat, not to make the phone call. Send someone else. If you are truly alone, keep the airway clear and shout.

Do not delay calling for help

The call happens in parallel with the rescue, not after it. A diver who recovers before help arrives has cost you nothing. A diver who does not recover has cost you everything.

Do not remove them from the water badly

Dragging a limp diver over a boat ladder headfirst or letting the head flop is how airways get compromised. Support the head through the lift, always.

Do not accept I am fine at face value

A diver who has blacked out or sambaed is a poor judge of their own condition. They end the session and they get evaluated by a medical professional, regardless of how good they say they feel.

Do not go back in

Neither the affected diver nor a rescuer who has just done a strenuous deep recovery should dive again that day.

The rescue steps above cover the common case, a short hypoxic blackout that resolves with airway control and stimulation. The uncommon case is a diver who does not restart breathing. At that point you are running a standard drowning and cardiac emergency, and the freediving specific part of the response is over.

When CPR is needed

• No breathing and no pulse after the diver is out of the water on a firm surface
• Rescue breaths given in water did not restore breathing
• The diver was unresponsive for a prolonged period before being reached

CPR requires a firm surface. That means the deck of the boat, a swim platform, a dock, or the shore. Getting there fast while keeping the airway clear is the priority once rescue breaths have failed. Follow the CPR protocol you were trained in, use an AED if one is available, and do not stop until professional responders take over.

Oxygen administration

• High concentration emergency oxygen is the standard first aid for any dive related hypoxic event
• Give it to any diver who blacked out, sambaed severely, or inhaled water, even if they appear recovered
• Only administer if you have been trained, for example through a DAN oxygen provider course
• Keep the diver still, warm, and monitored while oxygen is running

Making the call

• Call local emergency services first, 911 in the United States
• Contact the DAN emergency hotline for dive specific medical guidance
• Give your exact position, the number of casualties, and whether the diver is breathing
• Say the words freediving blackout, because it changes how responders prepare
• Stay on the line and follow dispatcher instructions

Print this, laminate it, tape it inside the boat locker. Under stress you will not recall a paragraph, but you might recall a row.

Rescue skill is muscle memory under stress, and muscle memory decays. Every recognised freediving course teaches rescue for that reason, and every one of them makes you repeat it until the grip and the airway hold are automatic. AIDA, SSI and PADI all include surface and depth rescue in their freediver progressions, and DAN supplies the first aid and oxygen provider training that sits alongside them.

A simple drill routine

1. 01 —Warm up, then have your buddy simulate a limp surface blackout at the float, eyes closed, no assistance.
2. 02 —Practise the approach, the head support, and the roll to a clear airway until it is smooth in chop as well as flat water.
3. 03 —Practise mask removal one handed while keeping the airway clear with the other.
4. 04 —Rehearse blow tap talk out loud, counting the fifteen seconds, so the timing feels real.
5. 05 —Practise the tow to the boat ladder or the shore with the head supported the whole way.
6. 06 —Rehearse the lift out of the water, which is the step most people have never actually tried.
7. 07 —Run the phone call out loud, including your position and the words you would use.
8. 08 —Swap roles and repeat. Both of you need the skill, not just the stronger swimmer.

Pair the drills with the communication side, because a rescue that starts late usually started late because nobody agreed on the plan. Fixed signals, an agreed dive time, an agreed meeting depth, and a stated maximum before anyone gets in the water are what turn a buddy into a safety. That framework is set out in the freediving buddy system, and the signal set itself is in freediving hand signals.

One last time, because it is the most important sentence on this page. This article is educational and does not replace hands on rescue training from a certified freediving instructor. Book the course, refresh it, and make sure the person watching you has done the same. Anyone who has blacked out or lost motor control needs medical evaluation, without exception and without delay.