New Oceana was . . . insert brief lead here and use past tense throughout article. See the Manual of style and Layout guide if you have questions.
New Oceana was a colony world that, at some point, had been drowned due to rising sea levels and catastrophic global warming. A nomadic race of amphibians had inhabited the planet.
The Twelfth Doctor visited New Oceana on a tour ship. (COMIC: Beneath the Waves)