Bhopal
In 1984 a poisoned gas was leaked from a private chemical factory at night when a worker was cleaning out a clogged pipe connected with a tank containing gas. The tank had 42 tons of methyl isocyanate (MIC) that was leaked at midnight and leaving more than 5,000 people and animals dead. Many people also became sick and they are still suffering from deadly diseases. This has been called as "World's worst industrial disaster".