Search on for Canadian filmmaker Rob Stewart who disappeared in Florida waters

The U.S. Coast Guard is searching for a Canadian filmmaker who was reported missing while diving Tuesday near Alligator Reef.

The Coast Guard said in a statement rescuers were dispatched after receiving a call for a missing diver from a crew member of the vessel Pisces.

The Navy, police and Florida wildlife conservation commission have joined in the search, and the coast guard has deployed multiple boats and an Air Station Miami MH-65 Dolphin helicopter to help with the rescue mission.

"Rob Stewart was scuba diving on the queen of Nassau wreck, six miles off shore of Islamorada Florida, when he disappeared after surfacing", reads a statement on the page.

Alexandra said her brother and the other diver surfaced, but the other diver struggled to get on the boat.

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The particularly deep and hard dive was his third of the day, his sister Alexandra Stewart told the state broadcaster CBC, adding that another crew member appears to have temporarily lost consciousness when he resurfaced.

According to the Canadian Broadcasting Corporation, Stewart was with three other divers when he went missing, but they were all reported safe.

The reason for Stewart's disappearance remains unknown.

He is best known for his award-winning 2006 documentary Sharkwater. "We remain hopeful that we'll be able to find him alive".