Page 2 states that the subsurface Foundation had believed themselves to be the only human survivors of a "space-born" disaster. The montage cover of "Children of Leviathan" Part 1 appears to depict Earth and Moon with an asteroid heading towards them, suggesting that perhaps it was an asteroid that was the catalyst of the deluge that turned Earth into Waterworld.

Page 6 confirms that the Deacon of the Valdez was a worshipper of Leviathan, as speculated in the study of "Children of Leviathan" Part 1.

On page 10, a chairman of the Foundation tells the president that the Mariner assured him he would return to help them and the president retorts, "With what, Mr. Chairman? Dolphins and seahorses?" This is probably a reference by the writers to the comic book and cartoon character Aquaman from DC Comics, who is similar to the Mariner in that he can breathe both underwater and above it. Aquaman has also been known to ride giant seahorses and can summon other sea creatures to do his bidding, such as dolphins and whales. A similar character called the Sub-Mariner exists in the Marvel Comics universe, though he does not have any significant ability to communicate with sea creatures.

On page 12, the Mariner ruminates on what he is and why he has gills and why his fingers are webbed. But in Waterworld, he was not depicted with webbed fingers, just webbed toes. 

In the letters column of this issue, the editor answers a question about the background of Earth since the deluge: It has been at least a century since the deluge, but not enough time for creatures such as the Whalefin and the Mariner to have evolved...naturally, that is.