Chennai Metro Rail has submitted detailed feasibility reports (DFR) to the state government for extending Metro Phase II, recommending the extension of the line from Koyambedu to Avadi and further study for extending the metro to Mahabalipuram along OMR from Siruseri, while dropping the plan for a Siruseri-Killambakkam bus terminus line.

An official release said that CMRL managing director MA Siddique has submitted the DFRs to Ramesh Chand Meena, additional chief secretary, Special Initiatives, at the secretariat.

"The proposed detailed feasibility study recommends Metro Rail for Corridor 5 (Madhavaram-Shollinganallur) Extension from Koyambedu to Avadi via Thirumangalam, Mogappair for a total length of 16.07 km with tentative 15 elevated stations for an approximate estimated cost of Rs 6376.18 crore, " CMRL said.

It has recommended exploring the possibility of the extension from Avadi to Pattabiram during the Detailed Project Report considering the recent developments such as the IT Park at Pattabiram, land availability and future growth potential.