Cachalot.

Description:

Cachalot is an ocean planet where humans have begun building floating cities. It is also the planet where all of Earth’s cetaceans were transplanted six hundred years ago after the Covenant of Peace was enacted with all intelligence-enhanced ocean dwellers. Five of these cities had been destroyed when a middle-aged scientist and her late-teen daughter were dispatched to the planet to discover the source of the attacks.

subjects: American Science fiction,  Science fiction, American,  Fiction, general,  Fiction, science fiction, action & adventure,  Fiction, science fiction, genetic engineering,  Fiction, science fiction, alien contact,  Fiction, science fiction, space exploration

Times: Set on an ocean planet in the future