Fear that thawing permafrost caused damage to storage tank.
Toxic fuel from 21,000 ton leak reaches pristine lake, bypassing floating booms, as rivers of diesel pollution cover-up is exposed.
Russian ecologist says his undercover trip shows Arctic ecosystem is irreversibly damaged, as whistleblower in ecological watchdog quits and leaves town.
Company’s bulldozer was in such rush to dismantle pipes after being filmed by ecologists that it crashed a police car.
One worker seriously injured and panic among nearby residents in secretive community, but public being reassured about incident.
Bad weather preventing clean up amid fears for endangered sea lions.
As closed city prepares for construction of new reactor, one scientist calls for an inquiry to address environmental concerns of past 50 years.
Satellites show giant hole ringed by 20 'baby craters'.