Ancient Aliens Season 2, Episode 4, titled 'Underground Aliens,' examines a cave in Ecuador claimed to contain books about alien technology and an ancient underground city in Turkey.
Notes on verification
Confirmed by multiple independent sources (IMDb, Rotten Tomatoes, History.com, fandom wiki) matching episode number, title, and synopsis details. [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://www.imdb.com/title/tt1784799/ (corroboration)
- https://www.rottentomatoes.com/tv/ancient_aliens/s02/e04 (corroboration)
- https://ancientaliens.fandom.com/wiki/Underground_Aliens_(Se2_Ep4) (corroboration)