Icebreaker John A McDonald on a rescue mission in the Gulf of St. Lawrence, Canada.

Icebreaker John A McDonald at work in the Gulf of St. Lawrence, Canada. White whales in water. Crewmen inside the icebreaker. Helicopter on the deck of John A McDonald. Pilot sitting inside helicopter. Aerial view of icebreaker from helicopter. Icebreaker plows up the path to the sea for two freighters trapped in ice.