THE CLOCK: BURIAL TO FRESH AIR
15 min · Free lesson · written from fifteen years in the terrain
After this lesson you know the survival curve by heart, which minutes of a burial are worth the most, how long each phase of a rescue actually takes when it is measured, and the standards this platform trains to so that our people reach fresh air inside the window that matters.
The Technique
- **Everything in avalanche rescue hangs off one curve, so learn its shape before you learn anything else.** From the Swiss and Canadian burial data analysed by Haegeli and colleagues, more than twelve hundred complete burials across the two datasets, survival runs in four phases. **For roughly the first fifteen to twenty minutes, survival stays above ninety per cent.** The people who die in that window die of trauma, of the ride down, not of the burial itself. **Then from about eighteen to thirty five minutes the curve falls off a cliff, down to around thirty five per cent.** That is the asphyxia phase, and it is where nearly all the preventable deaths live. From thirty five to about ninety minutes it plateaus, carried by the people who have an air pocket. Beyond that it declines again as cold and carbon dioxide do their slow work.
- **Read what that shape means, because it should reorganise your priorities.** Asphyxia accounts for roughly three quarters of avalanche deaths, and the losses concentrate in one seventeen minute window. **Three minutes saved inside the eighteen to thirty five minute window is worth vastly more than the same three minutes saved anywhere later on the curve.** Genswein puts the operational rule bluntly: no compromise gets made between saving lives and gentle handling in the first thirty five minutes. And the reference line the researchers mark on their charts is **ten minutes as the limit of probable rescue.** That is the number to build a training programme around.
- **The air pocket is why the plateau exists, and it is also why we teach what we teach.** The AvaLife data puts the median burial depth of victims without an air pocket at one metre, against sixty centimetres for those with one. It is also why we teach you to fight for a space in front of your face as the snow slows, and why the burial first aid module has you checking for snow plugs the moment the face is clear. **An airway and a fist of space buy the plateau. The plateau buys your crew time to reach you.**
- **Now put measured times against that curve, and see the problem.** In advanced companion rescue simulation, the whole search through to the first probe hit **averages three minutes forty three.** Coordinated excavation, measured by Genswein and Eide, takes **about six and a half minutes at one metre of burial, fourteen and a half at two, and nearly seventeen at three.** Dig rates across three hundred and ninety one measured rescuers ran at a median of about twenty five centimetres of depth per minute in soft debris and thirteen in hard. **The search is minutes. The dig is most of the clock.** At two metres, a perfectly executed search still leaves the excavation alone carrying you deep into the asphyxia phase.
- **A peer-reviewed manikin study makes the same point from the other direction and adds two findings that should sting.** Wallner and colleagues measured medical students extricating a buried manikin: median two and a half minutes to first contact, **seven point two minutes to airway access**, ten to a position where resuscitation could start. The number of rescuers made **no significant difference**, one dug about as fast as two. Burial position made no difference either. **What made the difference was training: trained participants completed the sequence in six point one minutes against eleven for untrained**, and even within the experiment, third attempts beat first attempts by three minutes. **Bodies do not dig people out. Practised technique digs people out.**
- **So here is what "time to fresh air" means on this platform, and why we use that phrase instead of "time to extraction".** The clock that kills is the airway clock, not the extraction clock. Genswein and Eide's phase data shows a large step between "head free" and "entire body free", which means a rescue aimed at fully freeing the body reaches the airway minutes later than one aimed at the face. **We train to the face: probe strike, dig to the airway, clear it, breaths if trained, and the body comes out while treatment is already running**, exactly as the burial first aid module drills it. Fresh air first. Everything else second.
- **What we do to compress the notice.** The curve starts at the moment of burial, not the moment somebody realises. That is why the trailhead check module exists, why every rider on our trips carries and wears what they carry, and why the point last seen and direction of travel are drilled as a two second habit: the survival phase is only useful if the rescue starts inside it.
- **What we do to compress the search.** Lane discipline from the advanced search module, so a team sweeps once instead of twice. The fine search drilled to inside a metre, because a tight fine search puts the probe strike seconds away and a sloppy one wastes minutes in repeated bracketing and probing. Brand tells and the micro strip fallback from the transceiver module, so a marking failure costs seconds instead of minutes.
- **What we do to compress the dig, which is where the biggest gain lives.** The V conveyor from the advanced rescue module: start downhill of the probe by one to two times the burial depth, two on flat debris and one on a steep slope, cut blocks, spoil moves down and away, rotate the lead before they fade. Uncoordinated digging took **forty two per cent longer at one metre and more than twice as long at two and three metres** in the measured data. There is no other trainable skill in this sport with a return like that.
- **And here are the standards, because a programme without numbers is a vibe, not a programme.** The American Avalanche Association's professional expectation is **two beacons located and surfaced from a fifty by fifty metre area in under seven minutes.** The AMGA's ski guide prerequisite is **three buried transceivers located in under ten minutes, consistently.** Those are professional bars and we cite them honestly as such, but the ten minute line is also the survival line, so our drill targets point at the same place: **single burial on our practice fields, probe strike inside four minutes and airway inside ten, timed, every time, and the times written down.** What gets timed gets faster, and the within-experiment learning effect in the research says the third attempt will beat the first by minutes. That is the cheapest survival gain on this entire platform.
- **Close with the honest version of the maths.** A rider buried at a metre, crew of three, everything done right: a couple of minutes to notice and organise, under four to the probe strike, six and a half of coordinated digging, airway work at the face. That lands around the thirteen minute mark, inside the survival phase and well before the cliff, survival odds still strong. The same burial with a ragged search and uncoordinated digging lands deep inside the asphyxia window, where the curve is falling fastest. **The difference between those two outcomes is not fitness, equipment or luck. It is drills, done before the season, against a clock.**
Common Mistakes
Training as though the search is the rescue. Fix: the search is under four minutes when drilled. The dig is six to seventeen. Split your practice time accordingly.
- Aiming the dig at freeing the body. Fix: aim at the face. Airway first, breaths if trained, and extraction continues around the treatment. The killing clock is the airway clock.
- Throwing more people at the digging without structure. Fix: in the manikin study one rescuer dug about as fast as two. Structure, not headcount, is what moves the clock.
- Treating the ten minute line as unreachable. Fix: professional standards sit at seven minutes for two burials. Ten minutes for one, with an airway, is a trainable target for a practised recreational crew.
- Practising without a timer. Fix: what gets timed gets faster, and the research shows third attempts beating first attempts by minutes. Write the times down and chase them.
- Forgetting the notice time. Fix: the curve starts at burial, not at realisation. Trailhead checks, eyes on your partners, point last seen as a reflex.
The Drill
The full clock drill, run at least once before every season and once mid season. Bury a person-weighted dummy, or a duffel packed to body length and roughly twenty five kilograms with a clearly marked head end, with a transmitter, at one metre on a marked practice field. Do not use a small daypack, because crews who practise on daypacks dig holes too small to extract a person from. Run the entire sequence as a crew against a single visible timer: notice, organise, search, probe, conveyor dig, airway cleared at the marked head end. Record four splits: start to probe strike, probe strike to first contact, first contact to airway, and total. Targets: probe strike inside four minutes, airway inside ten. Run it three times in the session and watch the learning effect the research promises show up in your own numbers. Keep the times season to season, per rider and per crew.
The survival figures here describe populations, not individuals, and nothing in this lesson guarantees an outcome inside any window. People have died in short burials and lived through long ones. The numbers exist to aim your training at the minutes that matter most, not to tell you when to stop, and the doctrine from the burial first aid module stands: nobody is dead until they are warm and dead, and that decision belongs to clinicians. Do a certified avalanche course with field days, and treat every figure here as a reason to drill rather than a substitute for doing so.
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