Jim McElroy points to MikeMac's post regarding the 1986 Lake Nyos Disaster. Take a read! Indeed, this was among the strangest ways people died in the 20th Century.
As counterpoint, I suggest the 1963 Vajont Dam disaster in Italy was just as strange. All that water in the new reservoir lubricated rock, eventually triggering an avalanche, and the resulting phenomenon of a megatsunami:
On October 9, 1963 at approximately 10:35pm, the combination of the third drawing-down of the reservoir and heavy rains triggered an enormous landslide of about 260 million cubic metres of forest, earth, and rock, which fell into the reservoir at up to 110 km per hour (68 mph). The resulting displacement of water caused 50 million cubic metres of water to overtop the dam in a 250-metre high wave. Despite this, the dam's structure was largely undamaged — the top metre or so of masonry was washed away, but the basic structure remained intact. However, the flooding caused by the landslide destroyed the villages of Longarone, Pirago, Rivalta, Villanova and Faè, killing 1,450 people. Many small villages in the territory of Erto e Casso and the village of Codissago, near Castellavazzo, were largely wrecked. Almost 2,000 people (some sources report 1,909) perished in total. Damage was also caused by the air displacement caused from the immense "splash" in surrounding villages.
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