RUSSIA (PIX11) – A deadly extreme sports accident was caught on tape in the mountains of Russia.

The sport is called zorbing in which two men board an inflatable ball called a zorb.

The ride starts off just fine, but the zorb suddenly veered off course.

Then, the ball picked up uncontrollable speed and went down a ravine.

Both men were thrown from the tumbling ball. One of them died, the other was badly injured.