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- Season 1 1993-12-10
- Season 2 1994-12-16
- Season 3 1995-08-20
- Season 4 1996-09-02
- Season 5 1997-08-17
- Season 6 1998-07-27
- Season 7 2000-01-03
- Season 8 2001-01-08
- Season 9 2002-01-02
- Season 10 2003-01-01
- Season 11 2004-01-16
- Season 12 2005-01-05
- Season 13 2006-01-04
- Season 14 2007-01-17
- Season 15 2008-01-07
- Season 16 2010-01-14
- Season 17 2010-10-29
- Season 18 2011-10-03
- Season 19 2013-07-16
- Season 20 2021-02-20
- Season 21 2021-07-25
- Season 22 2021-11-28
- Season 23 2022-02-16
Season 23 Episode
- Season 11 Guns of the Russian Military
- Season 11 The F-15
- Season 11 The Submarines
- Season 11 Pacific Coast Highway
- Season 11 Gangster Guns
- Season 11 Ship of Gold
- Season 11 Racetrack Tech
- Season 11 Oil Fire Fighting
- Season 11 Command Central
- Season 11 Front Line Reporting
- Season 11 Nature's Engineers
- Season 11 Bible Tech
- Season 11 The Power Grid
- Season 11 Bathroom Tech
- Season 11 Engineering Disasters 6
- Season 11 F-18 Hornet
- Season 11 Hydraulics
- Season 11 The Subs of WWII
- Season 11 Plane Crashes
- Season 11 D-Day Tech
- Season 11 A-10 Tankbuster
- Season 11 Rubber
- Season 11 City Water
- Season 11 Greatest Movies Gadgets
- Season 11 Robots
- Season 11 Nuclear Tech
- Season 11 Apollo 11
- Season 11 World War I Tech
- Season 11 Distilleries
- Season 11 Oil Tankers
- Season 11 Athens Subway
- Season 11 Extreme Aircraft
- Season 11 Engineering Disasters 7
- Season 11 George Washington Bridge
- Season 11 Building a Skyscraper: The Skeleton
- Season 11 Building a Skyscraper: The Exterior
- Season 11 Building a Skyscraper: The Human Environment
- Season 11 Building a Skyscraper: The Arteries
- Season 11 The Sears Tower
- Season 11 St. Lawrence Seaway
- Season 11 Guns of WWII
- Season 11 St. Lawrence Tech
- Season 11 Police Pursuit
- Season 11 SOS Tech
- Season 11 More of the World's Biggest Machines
- Season 11 Firefighting: The Arson Detectives
- Season 11 Guns of Israel
- Season 11 Engineering Disasters 8
- Season 11 Harvesting
- Season 11 Engineering Disasters 9
- Season 11 Guns of the Civil War
- Season 11 Engineering Disasters 10
- Season 11 Presidential Movers
- Season 11 Gas Tech
- Season 11 Engineering Disasters 11
- Season 11 The World's Longest Bridge
- Season 11 Japanese Sub at Pearl Harbor
- Season 11 M1 Abrams Supertank!
- Season 11 Engineering Disasters 12
- Season 11 Surveillance Tech
- Season 11 Engineering Disasters 13
- Season 11 Submarine Disasters
- Season 11 Engineering Disasters 14
- Season 11 Movie Theaters
- Season 11 Washington Monument
- Season 11 Engineering Disasters 15
- Season 11 Snack Food Tech
- Season 11 More Dangerous Cargo!
- Season 11 Commercial Fishing
- Season 11 Ancient Discoveries (1)
- Season 11 Ancient Discoveries (2)
- Season 11 Ancient Discoveries (3)
- Season 11 Engineering Disasters 16
- Season 11 Doomsday Tech
- Season 11 More Doomsday Tech
- Season 11 The Computer
Modern Marvels - Season 11 Episode 40 St. Lawrence Seaway
7.90 44 minutes The St. Lawrence Seaway is a monumental stairway in water, lifting massive ships hundreds of feet over thousands of miles. It’s the world’s longest inland waterway, a system of rivers, lakes, canals, dams, and locks that stretches 2,400 miles. And it’s one of the greatest engineering triumphs of the 20th century, pulled off against the violence of raging water and extreme winter. An essential part of the commercial infrastructure of the US and Canada, this complex system provides direct access from the Atlantic to North America’s heartland, enabling ships packed with trade to stop at any one its 65 ports–from Montreal to Duluth. From the 16th century, when French explorer Jacques Cartier searched for the legendary Northwest Passage, to the modern Seaway, built in the 1950s, we highlight the incredible engineering feats that went into creating the waterway.
