Ancient Aliens Season 2, Episode 3, titled 'Underwater Worlds,' features the lost city of Atlantis, ruins beneath Lake Titicaca, and sunken cities where aliens and humans allegedly mixed.
Notes on verification
Confirmed by multiple independent sources including History.com's official episode listing, IMDb, Rotten Tomatoes, and the Ancient Aliens Wiki, all matching the episode's title, number, and content description. [tier=bronze indep_score=0.3 clusters=3 claim_tier=everyday]
Sources
- Watch Ancient Aliens Season 2 Episode 8 | HISTORY Channel (seed:history_and_archaeology)
- https://ancientaliens.fandom.com/wiki/Underwater_Worlds_(Se2_Ep3) (corroboration)
- https://www.rottentomatoes.com/tv/ancient_aliens/s02/e03 (corroboration)
- https://www.imdb.com/title/tt1776385/ (corroboration)