A drama documentary that tells the extraordinary story of why nearly two thousand people died suddenly near the volcanic Lake Nyos in 1986. The popular opinion is that the victims were suffocated by volcanic gases erupting out of the lake. However scientist George Kling finds no supporting evidence and wonders if another natural event is to blame. Two years before the disaster there were similar deaths in Cameroon by another volcanic Lake. Icelandic volcanologist Haraldur Sigurdsson ruled out a volcanic eruption in favour of a new form of natural disaster he called Lake Overturn - where vast amounts of the natural gas carbon dioxide burst from the depths of the lake to form a giant cloud of CO2 that can kill through suffocation. His hypothesis was rejected, but Kling believes exactly the same occurred at Nyos and sets out to prove it - before it happens again.
—Tigress Productions