During World War II, a daring and long hidden mission unfolds in the Italian Alps as one soldier carries out a risky plan that remains secret for decades. See more in Season 2, Episode 4, "Black Ops." Watch new episodes of Secrets Declassified with David Duchovny Fridays at 10/9c; and stay up to date on all of your favorite The HISTORY Channel shows at history.com/schedule. #HISTORY #SecretsDeclassified From black ops and bizarre experiments to deadly cover-ups and nefarious gadgets, David Duchovny pulls the curtain back on all the government secrets in modern history we always suspected, but were never given the answers to. Through the strange and shocking things countries the world over - and those who work for them - have done in the name of national interest, we'll investigate the explosive evidence from newly declassified files that will finally shine a new light on what's really going on deep in the shadows. Don't miss a video! Subscribe NOW: https://www.youtube.com/@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: https://www.history.com/videos Sign Up For History Emails: https://www.history.com/emails/sign-up Browse Topical Videos: https://www.history.com/topics Facebook: https://www.facebook.com/HISTORY/ Instagram: https://instagram.com/history TikTok: https://tiktok.com/@history X: https://twitter.com/history YouTube: https://www.youtube.com/@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. © 2026 The HISTORY® Channel CIA Builds Underground Communication Network (Season 1) | Secrets Declassified with David Duchovny https://www.youtube.com/@HISTORY/