Alcatraz, the world’s most notorious prison, reveals its deepest secrets after the deadly waters that surround it are drained away. ➡ Subscribe: http://bit.ly/NatGeoSubscribe ➡ Get more Nat Geo Full Episodes:    • National Geographic Full Episodes   ➡ Get more Nat Geo Wild Full Episodes: https://www.youtube.com/watch?v=qAG2SkTPltw And check out more National Geographic series and specials here: ➡ Disney Plus: https://on.natgeo.com/3q6on5p ➡ Hulu: https://www.hulu.com/welcome ➡ NGTV app: https://www.nationalgeographic.com/tv/ ➡ ABC app: https://abc.com/ #FullEpisode #DrainTheOceans #NationalGeographic Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta TikTok: http://www.tiktok.com/@natgeo Tenor: http://on.natgeo.com/31b3Koc About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Drain Alcatraz: The World's Most Notorious Prison (Full Episode) | Drain the Oceans SPECIAL https://www.youtube.com/watch?v=fW7cG0apZwU National Geographic null