The Joint Rescue Coordination Centre at CFB Trenton is overseeing a major search for four commercial fishermen on Great Slave Lake.
The four have been missing since Sunday (September 29).
A Twin Otter aircraft from 440 Transport Squadron out of Yellowknife is involved in the search along with the Coast Guard and RCMP.
Great Slave Lake is 469 km long and 20 to 203 km wide and is the tenth largest lake in the world.
