From a life-poor patch of ocean in the South Pacific to a life-rich lake in the East African Rift System, clear waters can be found in all different corners of the world.
The scientists said the locale was almost certainly a primordial lake bed, rich in clay minerals, where the water many eons ago wasn't too salty or alkaline for life to thrive.
And fertiliser-maker Akron is preparing to develop apatite fields in the Khibini mountains, an area used for reindeer grazing above the salmon-rich river system that runs south from Lake Imandra.
It is thought that recent high rainfall had displaced the CO2-rich water at the bottom, releasing a massive bubble of carbon dioxide gas from the lake in a natural phenomenon now referred to as "lake overturn".