Winter storms freeze a passenger ferry in place on the banks of a raging river; Matt races on land; Herbie battles ice, tides and weather to get to the ferry on time.

Shawn and the dive team are working on an undercover job for the Canadian Navy, but it's a logistical nightmare with divers, shore connections and classified hardware getting lowered down the ocean floor.

A great white shark makes a dirty job even harder, but the real danger is from the dive. It goes bad and Garry's rushed to the hospital. His life and his career are on the line.

A category two hurricane heads straight for Dominion Diving; Matt, Robin and Shawn scramble to secure boats for the company and their clients.

Dominion helps the port get ready for the largest container ships ever built.

Dominion Diving celebrates 50 years of business; Matt gets called away from the party by a job in Azerbaijan, but he needs specialised survival training first.