Boating experts say NY yacht overcrowded; 3 dead Updated 5:28 PM ET (CBS/AP) OYSTER BAY, N.Y. - A yacht that capsized with 27 friends and family aboard on an outing to watch Fourth of July fireworks was severely overcrowded and doomed to tip over, safety experts said Thursday as the skipper blamed the tragedy on a wave that came out of the dark. Three children died after becoming trapped Wednesday night in the cabin of the 34-foot vessel off Oyster Bay, on the north shore of Long Island. Sal Aurelino, who was at the helm of the Candi I, told TV's News12 Long Island that he saw two lightning bolts, and then a wave suddenly hit. Aurelino's nephew David Aurelino, 12, and two girls, 11-year-old Harley Treanor and 8-year-old Victoria Gaines, died. The 24 other passengers -- a combination of adults and children -- were rescued from the water, mostly by fellow boaters, and were not seriously hurt. It was chaos," said Aurelino, who didn't answer the door to The Associated Press. The cause of the accident was under investigation, but it could have been the weather, overcrowding, the wake from another vessel, or a combination of factors, said Nassau County Detective Lt. John Azzata. The area was crowded with boaters watching the fireworks, he said. The Silverton yacht, built in 1984 but purchased recently, was under 60 feet of water Thursday and officials worked to raise it. The yacht company filed for bankruptcy in April, and no one was available to say what the maximum number aboard should be. Police and the Coast Guard would not say how many of those aboard were adults and how many were children. Safety experts said most boats have a manufacturer's plate that lists capacity by number of adults and by total weight. So theoretically, a boat could safely handle more passengers if some were children. Phil Cusumano, a Boston-based safety instructor and yacht captain with 35 years of experience, said there is no question the boat was badly overloaded. He said he would limit a vessel of that size to six adults. Other boating sites suggested a maximum of 15 passengers. "Twenty-seven is just crazy," Cusumano said. I wouldn't dream of doing that. I wouldn't do it at the dock, much less take it out on the water. It would tip over with the first turn. Each Fourth of July, countless vessels crowd the Long Island Sound shoreline to watch public and private fireworks displays. When the shows end, the exodus can be the nautical equivalent of a highway traffic jam. Scott Menzies, who said he positioned his 20-foot motor boat in the same area to take in the celebration but did not actually see the accident, estimated there were at least 1,000 vessels on the water. "It was pretty crazy," he said. However, conditions on the water were calm during the fireworks and afterward, Menzies said. Though there was some rain around 10 p.m., conditions were in "no way bad enough" to capsize a large boat on their own, said David Waldo, an expert boater who was also on the water Wednesday night. Waldo, executive director of the WaterFront Center, a nonprofit sailing school in Oyster Bay, called the number of people aboard the yacht "alarming." School sailboats around the same length have a capacity of seven, he said. "It's just asking for a situation where things can go wrong and compound on themselves," he said. The National Weather Service said a thunderstorm moved through the area around 10:30 p.m. -- about 20 minutes after the first 911 call -- and winds never exceeded 10 to 15 mph. Another boater told Newsday he saw the yacht turn and then tip over after it was hit by a wake. Balasso said he put the spotlight of his 38-foot speedboat on the capsized vessel and threw all the life jackets he had into the water. He said he rescued 20 people. Azzata said the boat should have had a life jacket for each person on board, but it wasn't yet clear if it did. Under state law, children under 12 are not required to wear life vests if they are in the main cabin, where the three victims were. Mike Treanor, who was related to some of the victims, answered the door at his suburban home in nearby Huntington.