Ackeron Thread

No longer a mystery, but the Lake Nyos disaster of 1986.

On August 21, 1986, 1,700 people and 3,500 livestock in towns and villages around Lake Nyos in Cameroon suddenly died of asphyxiation. At first, no one had any idea why...

http://www.neatorama.com/2007/05/21/the-strangest-disaster-of-the-20th-century/

http://en.wikipedia.org/wiki/Lake_Nyos