Agartala: ONGC's Executive Director Gautam Kumar Singha Roy during an interaction with journalists in Agartala on Oct 10, 2017. He said due to high pressure of gas and unusual formation beneath the soil, Tripura is the toughest zone for drilling and exploration of gas in the world. However, success ratio is 1:2 in the state against the world success ratio of 1:5.

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