The U.S. Coast Guard is searching the Atlantic off of the Florida Keys for a missing Canadian scuba diver.
"Assisting with the search are members from the Navy, Florida Fish and Wildlife Conservation Commission and Monroe County Sheriff's Office", reads a statement from the Coast Guard.
She said her parents and her husband are in Florida helping manage search efforts, but they still need those with experience to join the search that is being co-ordinated by the U.S. Coast Guard.
Born in Toronto, he's well known for underwater filming.
Stewart, 37, vanished Tuesday afternoon during a dive with three of his crew members at the Alligator Reef coral reef, some 4 nautical miles (seven kilometers) off the island of Islamorada.
Early Wednesday, Alexandra pleaded for assistance in the search.
The family is in shock, she said. "He was last seen at the surface of the water at 5pm from the dive boat". "As long as there's a chance of survival, we're going to search", Cangemi said in an interview.
Stewart is a wildlife photographer, filmmaker and conservationist.
Stewart was last seen diving near Islamorada in the Florida Keys, a chain of islands almost 200 kilometres off the state's southern tip.
His award-winning "Sharkwater" which examines sharks' place in the ecosystem, debuted at the Toronto International Film Festival in 2006.
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