Scientists have called for an urgent investigation after the appearance of several more craters.
A strange saucer-shaped object has been dug up by miners during excavation work in Siberia.
A medieval sword found in Siberia's Novosibirsk region may have belonged to the infamous Russian Tsar.
The winter weather has made it possible for researchers to climb down in to the hole for the first time.
Scientists have been seeking viable DNA samples from a well-preserved mammoth found in Siberia.
Scientists believe that they have finally determined what caused several huge holes to appear in Siberia.
A little girl somehow survived almost two weeks alone in a remote bear-infested forest in Siberia.
Two new unexplained craters have now been discovered in the permafrost of Russia's far north.
A massive crater has inexplicably opened up in Siberia's remote Yamal peninsula region.
Swimmers and sunbathers ran for cover as huge chunks of ice the size of golf balls rained down on them.
A mysterious virus dating back 30,000 years has been discovered frozen in the Siberian permafrost.
Authorities in Siberia have located a young man who had lived in the wilderness for almost two decades.
Evidence of prehistoric horse domestication has been discovered in Siberia's Denisova Cave.
A new study suggests that if the temperatures rises another 1.5C the permafrost could melt completely.
Divers exploring Lake Labynkyr have allegedly discovered mysterious skeletal remains in its depths.
The park is being promoted as a place from which visitors will have a chance to glimpse the creature.
Two men lost for months in the Siberian wilderness had to resort to extreme measures to stay alive.
An immaculately preserved mammoth carcass has been discovered in Siberia by an 11-year-old boy.
Sightings of the elusive hominid are on the rise ahead of next month's conference and expedition.
An expedition has discovered the well preserved remains of a mammoth in Siberia's Yakutia region.