NEW YORK (MCT) — A week after a boat loaded with July Fourth revelers capsized and sank off Long Island, killing three children, officials managed to retrieve the vessel from more than 60 feet of water Wednesday in hopes of determining the cause of the tragedy.

The Kandi Won, a 34-foot-long vessel, was carrying 27 people when it flipped over; it had been headed back to land after an evening on the water to watch Independence Day fireworks. The three who died, including the 11-year-old daughter of the boat’s owner, were found trapped inside the boat’s cabin.