The legendary island state that is said to have fallen out of favor with the deities and submerged into the Atlantic Ocean, is featured.

Examples:
Aquan underwater civilization on the planet Argo was preceded by a land civilization that was destroyed in the wake of global flood triggering earthquakes in tas1x13 "The Ambergris Element".

References:
https://en.wikipedia.org/wiki/Atlantis http://www.sf-encyclopedia.com/entry/atlantis