---
title: "How long can you survive in the death zone on Everest?"
description: "Hours to a couple of days. Above about 8,000 metres the body deteriorates no matter what you do. What actually happens physiologically, in what order, and what moves"
url: https://atoneplace.net/could-you-survive/everest-death-zone/
site: "At One Place"
---

# How long can you survive in the death zone on Everest?

**How long can you survive in the death zone on Everest?: Hours to a couple of days. Above about 8,000 metres the body deteriorates no matter what you do.**

Typically 16-48 hours; longest documented stays are a few days with supplemental oxygen

At the summit of Everest, atmospheric pressure is about a third of sea level, so each breath delivers roughly a third of the oxygen. Above about 8,000 metres the body cannot acclimatise at all — it simply consumes itself, losing muscle and fluid faster than it can rebuild them, with digestion largely shutting down. Judgement degrades in a way climbers describe from the inside as feeling fine, which is why so many decisions made up there look inexplicable afterwards. High-altitude cerebral and pulmonary oedema can develop within hours and are rapidly fatal without descent. Supplemental oxygen effectively lowers the mountain by around 1,500 metres and is what makes a summit day practical for most people; without it, the window is measured in hours.

## What happens, in order

| When | What |
| --- | --- |
| On arrival | Oxygen saturation in the 50-70 per cent range, versus 95+ at sea level |
| Hours | Cognitive slowing, poor decisions, no appetite, rapid dehydration |
| 1-2 days | Progressive deterioration; risk of cerebral or pulmonary oedema climbs steeply |
| Descent | The only reliable treatment — losing altitude reverses most of it quickly |

> Range compiled from published high-altitude physiology and expedition medicine reports; individual acclimatisation varies widely.

> 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.

## Places

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- [Could you survive on Mars?](https://atoneplace.net/could-you-survive/mars/) — Unprotected, under two minutes. In a pressurised habitat, indefinitely — the limits become supply and radiation.
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- [How long could you survive in the Mariana Trench?](https://atoneplace.net/could-you-survive/mariana-trench/) — Unprotected, no measurable time at all — the pressure is over a thousand times atmospheric. In a submersible, as long as the life support lasts.
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## Common questions

### How long can you survive in the death zone on Everest?

Hours to a couple of days. Above about 8,000 metres the body deteriorates no matter what you do.

## Related pages

- [How long could you survive in deep space?](https://atoneplace.net/could-you-survive/deep-space/)
- [Could you survive on Mars?](https://atoneplace.net/could-you-survive/mars/)
- [How long can you survive adrift in the open ocean?](https://atoneplace.net/could-you-survive/open-ocean/)
- [How long could you survive on the Moon?](https://atoneplace.net/could-you-survive/the-moon/)
- [How long could you survive in the Mariana Trench?](https://atoneplace.net/could-you-survive/mariana-trench/)
- [How long can you survive in Antarctica?](https://atoneplace.net/could-you-survive/antarctica/)
- [How long can you survive in the Sahara Desert?](https://atoneplace.net/could-you-survive/sahara/)
- [How long could you survive on Venus?](https://atoneplace.net/could-you-survive/venus/)
- [How long can you survive without water?](https://atoneplace.net/could-you-survive/without-water/)
- [How long can you survive without food?](https://atoneplace.net/could-you-survive/without-food/)
- [How long can you survive without air?](https://atoneplace.net/could-you-survive/without-air/)
- [How long can you survive without sleep?](https://atoneplace.net/could-you-survive/without-sleep/)
- [Can you survive being struck by lightning?](https://atoneplace.net/could-you-survive/lightning-strike/)
- [How long can you survive in freezing water?](https://atoneplace.net/could-you-survive/freezing-water/)

## Sources

- Typical range compiled from manufacturer specifications — At One Place (/about/)