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Update (February 1): Stewart's sister, Alexandra, told the CBC that he was doing a challenging dive of up to 70 metres that was part of the work for this new film, which is a sequel to the first Sharkwater documentary. She said he had been diving with three other divers, who are all safe.

Update (February 3): The U.S. Coast Guard has announced that it is suspending its search for Stewart at sunset (6:15 p.m. EST) today.

Update (Feb. 3, 5:05 p.m.): The U.S. Coast Guard has located Stewart's body.

Canadian filmmaker Rob Stewart has gone missing while diving in the water near Islamorada, Florida.

The U.S. Coast Guard launched a search for him today (January 31) near the Upper Florida Keys.

According to reports, he disappeared near the Alligator Reef.

Stewart is best known for his 2006 documentary Sharkwater in which he debunked media-generated fears about sharks and examined the shark-hunting industries of the world. He illustrated how these fears have led to their demise, which in turn has had a domino effect upon the ocean ecosystem.

In his 2012 documentary Revolution, he took a look at environmental problems around the world and what people are doing to solve them.

His next film, Sharkwater: Extinction, was slated for release this year.