On 21 August, 1986, 1,746 people died from carbon dioxide poisoning after gas escaped overnight from the bottom of Lake Nyos in Cameroon. RFI examines what happened in the world's deadliest "limnic eruption" and how, 40 years later, our understanding of the danger posed by volcanic lakes is still evolving.
The village of Nyos, in north-west Cameroon, was a peaceful place. On that day, its people carried out their work as usual – some in the fields, others leading cattle out to pasture.
