Massive Sinkhole Discovered in Siberia
Several large sinkholes have been appearing over Siberia.
Back in July a TV crew passing over the area by helicopter, saw one such new hole.
The seemingly random appearance of the sinkholes have scientists scratching their heads.
Over the past few years, 17 sinkholes have been discovered.
There is one theory as to how these sinkholes are developing. Drilling activities in the area could be the cause or at least a contributing factor.