He said various technical studies since 1955 had argued for feasibility of the project in the Palk Straits and that National Environmental Engineering Research Institute (NEERI) was in 2001 handed over the task of taking up new studies by then BJP government.
In a letter to party workers, the 88 year-old leader, a strong supporter of the project, said NEERI had recommended Alignment No.6 which he said included Adam's Bridge (Ramasethu).
He said the Environment and Forest Ministry had given its clearance in 2005 after various studies, adding "it is clear that the area around Adam's Bridge had no geographical evidence to show the existence of a man-made structure." Neither was there any archaeological proof.
While AIADMK general secretary and chief Minister J Jayalalithaa was now opposing the project in the light of Ramasethu, the party's election manifestos in 2001 and 2004 had argued for the project, he said.
At various points of time, the term Ramasethu never found a mention and was only known as Adam's Bridge, he said and pressed for the implementation of the project.