How long can you survive buried in an avalanche?

Avalanche burial has one of the steepest survival curves in all of rescue: the great majority of completely buried people who are found within about fifteen minutes survive, and the figure collapses over the following twenty. The reason is that debris sets like concrete on stopping, so most casualties cannot move at all, and exhaled carbon dioxide accumulates in the small volume of snow around the face. After the early phase, the remaining deaths are from asphyxia and from trauma sustained during the slide itself. This is why companion rescue with a transceiver, probe and shovel is the standard rather than waiting for an organised team — an outside rescue almost never arrives inside the window that matters. An air pocket in front of the face is the single strongest predictor of surviving a longer burial.

What happens, in order

What changes the figure

• Companion rescue within minutes is what the survival curve rewards
• An air pocket at the face changes the late-burial odds substantially
• Around a quarter of deaths are from trauma during the slide, which no rescue speed helps

Survival curve compiled from published avalanche accident studies; figures are for complete burial and vary by region and dataset.

Physiology, not instruction. Every figure here is a population range under particular conditions, and individual variation is large — temperature, exertion, fitness and health move all of them substantially. Nothing on this page is medical advice.

Situations

• Can you survive a plane crash? Usually — across all US airline accidents studied, more than 95 per cent of occupants survived.
• How long do you have to escape a sinking car? Usually 30 seconds to a couple of minutes of floating — and the window is the way out, not the door.
• Can quicksand pull you under? No. Quicksand is roughly twice as dense as a human body, so you float — you sink to about waist depth and stop.
• How far from a nuclear blast do you have to be to survive? It scales with yield: for a one-megaton airburst, survival is unlikely within about 5 km and likely beyond about 10-12 km.
• How long can you survive in a hot car? Under an hour on a warm day for a child — the interior gains about 20 °C in the first ten minutes.
• How long does it take to drown? Under a minute to lose consciousness — and it is almost silent, which is why so many drownings happen in sight of others.
• What happens if a lift cable snaps? Essentially nothing — lifts hang from multiple ropes and have a speed-triggered brake that grips the rails.
• What height can you survive falling from? Survival is common below about 6 metres and rare above 20 — but people have survived falls from thousands.
• How likely are you to survive a shark attack? Very likely — of roughly 60 to 80 unprovoked bites worldwide each year, fewer than ten are fatal.
• What happens if you fall into lava? You would not sink — lava is about three times denser than a body — but you would not survive the heat either.
• What should you do if you are caught in a rip current? Rips pull you out, not under. Swim parallel to the beach until you are out of the flow, then come in.
• Could you survive inside a whale? You cannot be swallowed by almost any whale — their throats are too narrow — and a stomach offers no air.
• How long do you have to escape a burning house? Around three minutes from the alarm sounding in a modern furnished home.
• Can you survive a tsunami? Yes, by moving inland and uphill immediately — 30 centimetres of moving water can knock an adult off their feet.