Vital for making its waters so 'pure', one theory is that rising underwater methane leaks are killing off the sponge, but is there a silver lining?

Scientist warns of 'environmental disaster' due to 'irreversible' pollution in world's deepest and oldest lake.

Waves on Russia's Pacific shoreline crafted old bottles, porcelain and tiles into a sparkling tourist attraction.

Government announces $1.8 bln package, while volunteers from all over the wolrd collect more than 450 tonnes of trash from the shoreline of the unique lake.

Shocking puce water as nearby nickel processing plant says cause is decades of contamination in Soviet times which company is working to overcome.

Image of 'polluted red river' caused shock but Nornickel stresses it is committed to cleaning up environment, and there will be no repeat.

The Usolyekhimprom facility, disused due to bankruptcy in 2017, is a ‘toxic catastrophe waiting to happen’.

Instagrammers still find a way - driving over fields of grass, wild cannabis and nettles to reach turquoise waters despite ‘dangers to health’.

Six campaigners staged a dramatic pre-dawn raid on Gazprom early today, clambering onto the company's floating production base in the Pechora Sea.