The eventual number of people who died in the Lake Nyos gas leak was put at more than 1, 700.
BBC: 1986: Hundreds gassed in Cameroon lake disaster
It revealed that Lake Kivu, in Rwanda, is becoming saturated with carbon dioxide just as Lake Nyos was, and is seriously at risk of lake overturn.
Pipes have now been put in place in Lake Nyos and nearby Lake Monoun to siphon water from the lower layers up to the surface and allow the CO2 at the bottom of the lake to slowly bubble out, preventing a repeat of 1986 tragedy.
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