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The guided missile frigate INS Betwa, a 3,850-ton ship more than 125 meters (410 feet) in length, rolled over on a 90-degree angle while being docked, Indian Navy spokesman D.K. Sharma told CNN.
"Our first priority is to get the ship in an upright position," Sharma said. "It is an unfortunate incident and one of the first in the history of the Indian Navy."
Sharma told CNN an investigation was underway to find out what had caused the accident.
The INS Betwa, a Brahmaputra class vessel, was first commissioned on July 7, 2004.
The incident comes at an unfortunate time for the Indian Navy, just two days after the country celebrated national Navy Day on December 4.