Five people died after a whale watching tour boat carrying 27 people sank off the coast of Tofino, British Columbia, on Sunday, rescue coordinators said.
One person was missing.
Twenty-one people have been rescued, said the Joint Rescue Coordination Centre.
A witness told CBC the boat sank far enough from shore that it could not be seen.
"You could see the smaller boats going back and forth to try and help bring people back to shore," Rami Touffaha told CBC.
The boat is a 65-foot cruiser, Jamie's said on its website.
It has three viewing decks - one upper and one lower and one in the back of the boat.
It seats 46 passengers comfortably, the website said.
