Larsen & Toubro (L&T) has won a Rs 1,250 crore turnkey project from Oil & Natural Gas Corporation (ONGC).According to a release issued by L&T to the BSE today, the company will have single-point responsibility for the complete engineering, procurement, fabrication & installation of the offshore platforms.'The project comprises building three smart well platforms, sub-sea interconnecting pipelines, sub-sea cables and topside modifications for the Mumbai High South field. It will involve 15,000 tonne of topside and jackets, 58 km sub-sea pipelines & 22 km sub-sea cables in addition to many state-of-the-art facilities. It is to be completed by April 2009," the release added.L&T will carry out the engineering design at their subsidiary L&T Valdel in Bangalore, and fabrication will be carried out at L&T's world-class shore-based manufacturing complex at Hazira near Surat as well as at the company's modern large fabrication facility at Sohar in Oman.