Russian scientists have recreated the giant Chernobyl nuclear accident in the world's biggest explosion chamber.
The powerful explosion happened in the city of Moscow in western Russia in controlled conditions and was done so scientists can collate results to help avoid nuclear accidents at power plants in the future.
The recreation was done inside a steel sphere which is 11 metres long with a wall thickness of 10 centimetres - the largest explosion chamber in the world which was built 10 years ago.
Scientists say the chamber helps to resist the explosion using a "ton trotyl power" - a TNT equivalent - with the findings enabling them to ultimately draw up specific recommendations to prevent emergency situations arising in future.
Footage of the explosion was taken and uploaded online.
The clip shows how after scientists closed the chamber securely, they start to fill it with an explosive gas mixture.
A massive bang can be heard and then seen on a TV screen which is filming inside the chamber.
Scientists say the findings will be shared with nuclear industry experts and other industries who work with explosion risks.