DMK chief M Karunanidhi today accused the Jayalalithaa-led Tamil Nadu government of adopting "double-standards" by opposing the Sethusamudram project in Supreme Court and said it was a "betrayal" with the state. "The AIADMK government had made a written submission in the Supreme Court saying the project was not at all needed," Karunanidhi, a staunch supporter of the multi-million rupees controversial project, said in a statement here.