Canadian filmmaker Rob Stewart missing after Florida dive, sister says time is ‘critical’

U.S. Coast Guard searching for Sharkwater filmmaker who vanished Tuesday night in the Florida Keys

Toronto filmmaker and conservationist Rob Stewart is missing after a Tuesday night dive off the coast of Florida.

The U.S. Coast Guard is on the scene Wednesday morning to search for Stewart, 37, who vanished while diving near Islamorada in the Florida Keys, a chain of islands between the Atlantic Ocean and Gulf of Mexico, located nearly 200 kilometres off the state’s southern tip.

“We’re in the critical window of daylight right after he’s gone missing where, if we’re going to find him on the surface — where we’d like to find him — it’s going to be today,” Stewart’s sister, Alexandra Stewart, said in an emotional interview with CBC Toronto on Wednesday morning.