Mega Marine Machines

At the Soo Locks, the most critical link in America's industrial chain, winter closes fast. Crews battle ice, time and brutal conditions to guide the final iron ore freighters through the system, while tugs, divers and air-bubbler systems work nonstop to keep the channel open. The last ship must pass before shutdown

Tomorrow · Monday, 20 July 1 airing
10:00
National Geographic Channel
S1 E3 · The Gate Keepers
Tuesday, 21 July 1 airing
20:00
National Geographic Channel
S1 E4 · Tug o' War
Friday, 24 July 1 airing
22:00
National Geographic Channel
S1 E4 · Tug o' War