On the peaceful evening of August 21, 1986, people living near Lake Nyos in Cameroon went to sleep just like any other day. Nobody knew that the blue, calm water of the crater lake was hiding a deadly secret. Without any explosion, earth tremor, or fire, a massive invisible cloud silently rose from the lake into the night air. Within a few hours, over 1,700 people and 3,500 farm animals lost their lives. Villages were wiped out in complete silence. Survivors woke up the next morning to find family members and livestock lying lifeless on the ground. There were no signs of injury or struggle. It was as if time had suddenly stopped in the valleys surrounding the lake.
The Deadly Secret Behind the Silent Killer
Scientists rushed to Cameroon to investigate this shocking event. They discovered that Lake Nyos sits directly over a pocket of volcanic magma. Over many years, heavy carbon dioxide gas had leaked from beneath the earth and trapped itself in the deep water at the bottom of the lake. On that unlucky August night, something disturbed the water, possibly a small landslide.
This caused the lake to burst like a giant bottle of warm soda. Around 1.2 million tons of carbon dioxide suddenly shot up into the air. Because carbon dioxide is heavier than air, the toxic gas cloud sank quickly into the surrounding valleys. It displaced all the fresh oxygen in its path. People and animals were smothered in their sleep before they even realized what was happening. Today, special pipes are installed in Lake Nyos to slowly release the gas and prevent another deadly disaster.
