Embedded video for The St. Lawrence Seaway - "The Eighth Sea"Learn from Walter Cronkite as he discusses the founding, construction, and operation of the St. Lawrence Seaway! Video Gallery 10/4/16 Saint Lawrence Seaway Development Corporation: Great Lakes, Great Opportunities 4/25/16 25th Anniversary Promotional Video of the St. Lawrence Seaway 4/25/16 Georgetown University Forum on the St. Lawrence Seaway (1959)