The fast, thick cloud of CO2 killed quickly and silently. It displaced all the ordinary air and remained in the village for hours. People first became drowsy and disoriented, then passed out and finally died as their brains were starved for oxygen. Animals were also killed, from large animals like cattle to small animals like insects. Unlike other disasters that scour the landscape and wreck infrastuctures, the only damage Lake Nyos suffered was a swath of vegetation right near the north side, where the forceful expulsion created an 80-foot wave. The rest of the plants lived, creating the eerie and upsetting sight of roads, fields, and houses still standing, but everyone in the villages dead.
http://www.youtube.com/watch?v=YEPNYRD09es
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