Lake Nyos eruption causes 200-foot wave
Minutes later, the placid lake erupted, spewing out an enormous burst of water that created a 200-foot wave and a concentrated fog of carbon dioxide vented from deep inside the Earth, The cloud blasted through twisting valleys, spreading more than 12 miles before dissipating. In the villages closest to Lake Nyos, nearly everything died. Helicopters that swept overhead the next day found cows, dogs and birds lying in the green fields and neatly swept dirt yards. Nearly 90 percent of the people in the worst-hit villages were dead, many still in then-beds where the gas quietly smothered them.