Description:20 44 19 00 Canada. Enormous boat icebreaker crosses the canal Saint Laurent as all the spring debuts to allow the boats to navigate, seen on boat which breaks the ice of the winter. Killer whales, maritime mammals follow the boat. Seen in the cockpit equipped with radar and other very elaborated material. Helicopter is on boat. Close-up helix which turns. Takeoff. Seen on real ica floe formed on canal and lake. Seen on boats which follow breeze freezes. Communications, transport.