It has nine prisons with around 11000 prisoners, double the numbers that it was meant to host.
Overcrowding leads to various crimes inside the jail itself. This could be reason for 20 suicides in the last 12 years. Two suicides were reported in 2012.
One of the riskiest times for prison suicides is near the time of the court appearance.
The Delhi government says mentally ill prisoners at Tihar Jail are treated by the prison's department of psychiatry, which has a 150-bed hospital.
It is considered India's most secure prison with three-layered security system. Surveillance and external security is with the personnel of ITBP and CRPF followed by Tamil Nadu Special Police which man various gates and frisk visitors.
The jail has adopted several forward looking projects like solar energy use and sale of goods made by prisoners at well-known retail outlets.