Construction on the project began in 1969. Four prefabricated sections of the 63rd Street Tunnel were constructed under the East River, the first of which was delivered in May 1971. That first section was lowered into place on August 29, 1971, and the last section was lowered on March 14, 1972. The double-deck, tunnel under the East River was "holed through" on October 10, 1972, with the separate sections of tunnels being connected. The estimated cost of the project was $341 million, and the MTA applied for $227 million in Federal funds.