On the night of August 21, 1986, the residents of Cameroon's Nyos valley went to sleep and never woke up. Nearly 1,700 people and thousands of livestock were found dead by morning. No signs of struggle, no visible cause. Just silence and 4 very confused survivors.

The lake was the murderer.

In this episode, we cover the full story of Lake Nyos: the night of the disaster, the survivors who described a strange smell and sudden darkness, the scientists who pieced together what happened, and the remarkable engineering now keeping it from happening again.

We also break down the science of limnic eruptions: how volcanic CO₂ silently accumulates in deep water under immense pressure, what causes a lake to suddenly "explode," and which lakes around the world (Lake Kivu) are still primed to do the same thing today.

This is a story about geology, chemistry, tragedy, survival, and what happens when nature operates by rules most of us never knew existed.

Resources:

• Kling, G.W. et al. (1987). The1986 Lake Nyos Gas Disaster in Cameroon, West Africa. Science, 236(4798). — Thefoundational post-disaster scientific paper.
• Evans, W.C. et al. (2005).Degassing Lakes Nyos and Monoun: Defusing Certain Disaster. Proceedings of theNational Academy of Sciences. https://www.pnas.org/doi/10.1073/pnas.0502274102
• Halbwachs, M. et al. (2020).Final Step of the 32-Year Lake Nyos Degassing Adventure. Journal of AfricanEarth Sciences.https://www.sciencedirect.com/science/article/abs/pii/S1464343X19302286
• Anzidei, M. et al. (2023).Evidence of Lake Nyos-Type Behavior in the Geological Record: A Review.ScienceDirect.https://www.sciencedirect.com/science/article/pii/S0012825223002921
• Britannica: Lake Nyos Disaster.https://www.britannica.com/event/Lake-Nyos-disaster
• Atlas Obscura: The InvisibleThreat Beneath Cameroon's Deadly Lake Nyos.https://www.atlasobscura.com/articles/lake-nyos-1986
• Mental Floss: Killer Lakes — WhyLimnic Eruptions May Be the World's Rarest Natural Disasters.https://www.mentalfloss.com/science/geology/limnic-eruptions-volcanic-lakes
• HowStuffWorks: How Did Lake NyosSuddenly Kill 1,700 People?https://science.howstuffworks.com/environmental/earth/geophysics/lake-nyos.htm
• FairPlanet: Cameroon: Lake NyosDisaster Survivors Afflicted by Civil War.https://www.fairplanet.org/story/glimmer-of-hope-for-lake-nyos-disaster-survivors/
• VOA News: Cameroon Lake NyosDisaster Survivors Feel Abandoned.https://www.voanews.com/a/survivors-1986-lake-nyos-disaster-cameroon/3474673.html
• University of Michigan —CO2-Driven Lake Eruptions resource.https://websites.umich.edu/~youxue/lakeerupt.htm

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