The largest natural sinkhole in the world, measuring 50 miles long by 75 miles wide.
The Berezniki sinkhole first appeared in 1986 and grows every year. Currently, it's more than 200m (650ft) deep, 80m (260ft) long, and 40m (130ft) wide.
100m (330ft) deep.
18m (60ft) wide, 60m (200ft) deep.
400ft deep, 40ft by 60ft opening.
There's several, individual sinkholes, each over 350m (1148ft) in diameter and 350m deep.
This large sinkhole is now a swimming destination.
This 15-story deep sinkhole appeared under 80 million tons of gypsum stack toxic waste and caused several million dollars in cleanup costs.
75ft wide by 35ft deep, emerged in a suburban neighborhood with aging water pipelines.
600ft wide by 200ft deep, also in a suburban neighborhood.