Cameroon: 'An Invisible Avalanche' - What Happened in Cameroon's 1986 Lake Nyos Disaster?
[RFI] 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.
On the night of August 21, 1986, a tragedy unfolded in the small village of Nyos, Cameroon. The unsuspecting residents of Nyos went to bed unaware that their peaceful lives would soon be disrupted by a disaster of unimaginable proportions. Hidden deep within the earth, Lake Nyos, a dormant volcanic crater lake, contained a lethal secret.
Carbon dioxide, trapped at great depths, built up over time due to volcanic activity beneath the lake. As the lake's waters were disturbed, likely by a minor earthquake, the gas-rich layers of water rushed to the surface in a violent eruption. This release of carbon dioxide created a massive cloud, heavier than air, which flowed down the slopes of the mountains like an invisible avalanche.
The cloud rushed through the valleys, carrying with it an invisible threat as it spread, consuming the oxygen in its path. The villages of Nyos, Subum, and Cha, situated near the lake, were the first to feel the impact of this invisible avalanche. Within seconds, the victims - approximately 1,746 people and 3,500 animals - succumbed to the suffocating gas.
The sudden loss of life left the survivors in shock. The following morning, the aftermath was evident in the form of a "heavy blanket of silence." Cattle, insects, birds, and people lay motionless, as if the life had come to a halt. News of the disaster spread, and television cameras captured the grim scene of death and devastation.
Despite the danger, locals were proud of Lake Nyos, a popular tourist attraction within an old volcanic structure. Their pride was short-lived, as they were blindsided by the disaster. In the years since the tragedy, scientists have worked to understand the danger posed by volcanic lakes and have found ways to mitigate the risk.
One of the most significant developments was the installation of de-gassing pipes in 2001, which have significantly reduced the concentration of carbon dioxide in Lake Nyos. Today, the lake stands as a global case study for research on volcanic lakes and gas-related natural disasters, providing valuable insights for other lakes with similar characteristics, such as Lake Monoun in Cameroon and Lake Kivu on the border of the Democratic Republic of Congo and Rwanda.
Written by urgent.news from AllAfrica's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
