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{{Quotation|'''The Seas''' -- Guests will board the clipper ship, "Spirit of Mankind," to sail through moments of peril and triumph with seven legendary mariners ... the great explorers who charted the seas for civilization. In another adventure, Poseidon the Sea Lord will challenge visitors to journey through ocean depths ... from the Continental Shelf to the Great Coral Reef. Finally arriving at "Sea Base Alpha," guests will experience an authentic ocean environment with live marine life, an undersea restaurant, and a showcase of oceanographic exhibits and displays <ref> Walt Disney Company. Walt Disney Productions 1977 Annual Report , 1977. July 2018. </ref>.}}

As plans for The Seas continued to develop, the makeup of the pavilion began to change. By 1980, the "clipper ship" attraction seems to have been removed. In this version of the pavilion, guests would enter The Seas through a “portal” which transported them into a grotto <ref name= "Martin"> https://www.youtube.com/watch?v=P7TGeBE_0cQ </ref>. From here, they would enter a large preshow theater. With a storm raging around them, the doors of the theater would close. With a strike of lightning, Poseidon would appear and calm the storm with a stroke of his hand. He then noted that despite mankind's superstitions regarding the sea, it was the oceans themselves that were the “cradle of life”. Looking back at the few men who were brave enough to explore the oceans, the god would then note that with wisdom and courage, guests too could explore the sea<ref name= "Martin"/>.

{{Quotation| "Visitors to The Seas pavilion will explore the wonders of the aquatic frontier through two major presentations. First, "The World of the Sea," a ride-thru experience presenting various ocean environments; and second, "Sea Base Alpha," a futuristic undersea research station complete with a 5,000,000-gallon tank supporting a living coral reef community." <ref name= "intercot"> http://www.intercot.com/edc/LivingSeas/lsconstr.html </ref>}}

Between 1980 and 1982, the tone of The Seas had clearly changed. Gone was the fantasy elements of the pavilion's designs, as the focus of The Seas shifted completely to the scientific, with an emphasis on the SeasBase portion of the pavilion the 1982 book EPCOT Center: Creating the World of Tomorrow, notes that while in The Living Seas ride guests would see: