Lake Nyos disaster: 40 years since deadly gas release in Cameroon

On August 21, 1986, a massive cloud of carbon dioxide was released from Lake Nyos in northwestern Cameroon, resulting in one of the country’s deadliest natural disasters. The gas cloud, which emerged from the volcanic lake, settled into nearby valleys and villages, displacing oxygen and suffocating approximately 1,700 people and thousands of livestock while they slept.

Geologists explain that the disaster was caused by carbon dioxide accumulating at the bottom of the lake, trapped under more than 200 meters of water. When the gas was suddenly released, it formed a silent, invisible fog that spread through the surrounding area. Survivors described a sudden, eerie silence and a sense of disorientation before collapsing.

Four decades later, the event remains a significant scientific and historical milestone. Researchers have studied the phenomenon to understand how gases from the Earth's mantle dissolve into the lake's depths, creating a potential for such limnic eruptions.