At least 54 people are missing after an explosion at Russia's largest hydro-electric power station killed eight workers, officials have said.
An oil-filled transformer exploded at the Sayano-Shushenskaya plant in Siberia while workers were carrying out repairs, bringing down the ceiling of the turbine hall, which then flooded.
A diver has so far pulled one worker from an area beneath the turbine hall, but it is unclear how many more people may be trapped inside.
The dam at the Soviet-era power station is 245m high and stretches 1km across the Yenisei river in southern Siberia.
The Russian authorities say that while there is no danger to the dam itself, the accident has caused a large oil slick that is now floating downstream.
RusHydro, the operator of the power station, said the damage would run into "billions of roubles" and would take several months to repair.
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