February 16, 2012. Oil and gas major ONGC said three of its KG Basin NELP blocks have run into rough weather following restrictions from the Ministry of Defence, and it may invoke 'force majeure' clause for two blocks. These two blocks were awarded in the 8th round of NELP to ONGC and Andhra Pradesh Gas Infrastructure Corporation (APGIC). ONGC was awaiting the response of Director General of Hydrocarbons on the issue. Force majeure is a clause in contracts which frees the parties from liability/ obligation on account of extraordinary event or circumstance beyond the control of the parties. According to APGIC, though the seismic survey was conducted in the two blocks, ONGC could not proceed as the Defence Ministry was yet to give green signal.