Shortly after midnight on December 3, 1984, a cloud of poisonous gas escaped from an American pesticide plant in the Indian city of Bhopal. It was the world's worst industrial accident.

Half a million people were exposed to lethal fumes from the Union Carbide factory. Twenty five years on, an estimated 120,000 survivors are still chronically ill.

Satinath Sarangi tells Jonathan Charles why he won't give up the fight for justice.

You can watch the full interview on Monday 17th March 2010 on BBC World News at 04:30, 09:30, 15:30, 21:30 GMT.

And on the BBC News Channel at 04:30 and 23:30.