Asking Centre to expedite steps to ensure a favourable verdict on the matter in the Supreme Court, the key UPA ally also said "some communal forces" had moved the apex court with a view to creating roadblocks.
"After considering various proposals over the route, then NDA government under A B Vajpayee had decided to implement the project on Alignment No.6 which involves the Adam's Bridge.
The Pachauri Committee, which submitted its report to the Supreme Court, has said the Sethusamudram shipping channel project is not viable on economic and ecological grounds.
Government has rejected the report and maintained that it intends to pursue the project which will cut through the Adam's Bridge, popularly known as Ram Setu.
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BJP spokesperson Ravishankar Prasad had said his party and the nation "will not tolerate" any tampering with the Ram setu, asking why cutting through it was the only solution.
The party had in its 2001 poll manifesto also spoke in favour of the Sethusamudram project, he said and added she had turned against it since she didn't want DMK to take credit.
Recalling that Prime Minister Manmohan Singh and UPA Chairperson Sonia Gandhi besides himself, then Chief Minister, had attended the inauguration of the project at Madurai, Karunanidhi said even then some had unsuccessfully approached the Supreme Court for a stay against the function.
Centre should take steps to get a favourable verdict from the court and ensure a better livelihood for people of southern Tamil Nadu, he said.
Ram Setu is the mythical bridge on which Lord Ram and his army crossed the sea to invade Ravan's kingdom. The project envisages dredging of a shipping channel across the Palk Straits between India and Sri Lanka.