Check out these biggest mysteries of Antartica. See more in this Ancient Aliens compilation. Watch full episodes and stay up to date on all of your favorite shows on The HISTORY Channel website at Chapters 00:00 Operation High Jump Begins 02:05 The Inner Earth Encounter 04:35 Silenced By The Government 08:26 The Buried Octagonal Structure 10:07 Atlantis And The Great Flood 12:06 The Lost Civilization Under Ice 15:24 The Battle At Antarctica 17:22 Entrances Beneath The Ice #HISTORY #AncientAliens Find out more about the show and watch full episodes on our site: "Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years. Don't miss a video! Subscribe NOW: @HISTORY?sub_confirmation=1 ABOUT THE HISTORY CHANNEL: The HISTORY® Channel, a division of A+E Global Media, is the premier destination for historical storytelling. From best-in-class documentary events, to a signature slate of industry leading nonfiction series and premium fact-based scripted programming, The HISTORY® Channel serves as the most trustworthy source of informational entertainment in media. FOLLOW HISTORY CHANNEL: Watch Full Episodes: Sign Up For History Emails: Browse Topical Videos: Facebook: Instagram: TikTok: @history X: YouTube: @HISTORY Copyright Notice: This video and my YouTube channel contain dialog, music, and images that are property of The HISTORY® Channel. You are authorized to share the video link and channel, and embed this video in your website or others as long as a link back to our YouTube Channel is provided. © 2025 The HISTORY® Channel Lost Civilizations Beneath Antarctica? | Ancient Aliens | History @HISTORY/