Angelina Sadovnikova, then 11, came across the mummified Pleistocene rodent in a cavity left by woolly mammoth tusk diggers.

Toxic fuel from 21,000 ton leak reaches pristine lake, bypassing floating booms, as rivers of diesel pollution cover-up is exposed.

Scientists say there is growing evidence that rising temperatures were catalyst for massive unexplained holes in ground.

Russian ecologist says his undercover trip shows Arctic ecosystem is irreversibly damaged, as whistleblower in ecological watchdog quits and leaves town.

Scientists rush to site of latest tundra eruption - which formed a crater 50 metres deep - amid fears for homes and key industrial sites.

Journey 'in search of my father', as joint Russian-American expedition sets out to bring home crashed wartime Douglas C-47 from tundra.

Gas bubbles from waters filling crater hole on Yamal peninsula two months after volcanic-style explosion in thawing permafrost.

Remnants of this land mass still exist in Russia, the US, Canada and Greenland, says groundbreaking new research.

Avelina Antsiferova fulfilled her life's dream when she sat in cockpit of wartime Douglas C-47, 69 years after kissing her papa goodbye for last time.

Boy was mauled to death, his sister managed to escape and raised alarm.