Mega Marine Machines
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 12:00 PM, Saturday 19 September. (Subtitles.)
Topics
News ➝ Current Affairs
Documentary