What went wrong at the Bhopal branch of the UCIL?

I'm sure you are referring to Union Carbide and the Bhopal
Gas Tragedy.

Union Carbide had opened a branch in India to
produce the pesticide carbaryl. The process of production involved the use of a chemical
called methyl isocynate which is a very poisonous gas. The demand for the pesticide fell
sharply during the 1980s and this led to excess inventory of methyl isocynate which the
company had to store as it cannot be disposed.

What
actually went wrong at Bhopal was Union Carbide's cost reduction plan which came at the
expense of safety and the lives of millions of Indians.

The
company reduced the number of employees in the plant drastically. None of the safety
norms were adhered to. According to an investigation done after the incident it was
found that the tragedy could have been easily avoided if the company had not left the
refrigeration system idle; the flare tower and the system to treat any escaping gas with
sodium hydroxide had been working; and the pipes and valves had been replaced as
required.

Union Carbide was able to do what it did due to
the poor enforcement of rules and regulations in India; something that will always stay
in the minds of millions who were disabled due to the gas leak and could never get
justice.