Mega Marine Machines

11:00 AM to 12:00 PM

Sunday 19 July

The Gate Keepers

Season 1 Episode 3

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

Mega Marine Machines airs on National Geographic Channel HD at 11:00 AM, Sunday 19 July. (Subtitles.)

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Documentary