The Metro has invited bids for the underground stations under five packages to ensure smooth execution of the works and to avoid delay. In the opening of the bids, three companies — L&T, Tata Projects and DRA Infracon — were the lowest bidders in the five packages. L&T has emerged as the lowest bidder for three packages — KMC to Royapettah, Radhakrishnan Salai to Adyar Junction and Adyar Depot to Taramani Link Road — while Tata Projects was the lowest bidder for Madhavaram to Perambur stretch stations and DRA Infracon for Ayanavaram to Kellys stretch.