Several people reported hearing a loud noise on August 15, 1984 around 22:30. A gas cloud reportedly emanated from a crater in the eastern part of the lake. The resulting deaths of residents in a low-lying area are believed to have occurred between 03:00 and dawn. The victims were said to have skin burns, which reports later clarified as "skin damage" such as discoloration. Survivors reported that the whitish, smoke-like cloud smelled bitter and acidic. Vegetation was flattened around the eastern part of the lake, probably by a tsunami.
Although Lake Monoun is near the center of a volcanic field that includes at least 34 recent craters, the subsequent investigation found that the event was not caused by an eruption or sudden ejection of volcanic gas from the lake. Rather, emission of carbon dioxide in a limnic eruption is thought to be to blame. The cloud's smell and skin damage to victims were not fully explained. Some theories attribute the skin problems to a combination of preexisting conditions and routine postmortem effects like livor mortis, although there is no clear consensus.
Among the victims were some of the riders in a truck carrying twelve people. The truck's engine stopped working, and the people inside the truck got out and were killed. Two people sitting on top of the truck survived, because their elevated position allowed them to breathe - carbon dioxide is heavier than air (oxygen and nitrogen) which causes it to stay close to the ground.
Two years later, a similar and even more deadly event occurred at Lake Nyos, about 100 km (62 mi) NNW. Along with Lake Nyos and Lake Kivu, Lake Monoun is one of only three lakes in the world known to have high concentrations of gas dissolved deep below the surface.
Read more about this topic: Lake Monoun
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