The spill of the fuel-water mixture occurred on the Ambarnaya River in Norilsk during the clean up from the consequences of the accident at the TPP-3.
Toxic fuel from 21,000 ton leak reaches pristine lake, bypassing floating booms, as rivers of diesel pollution cover-up is exposed.
The exact reason of the leak is yet to be established, but a statement from Norilsk Nickel company, which operates the site suggests it could have been caused - worryingly - by collapsing permafrost.
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