Secrets Declassified with David Duchovny

In the razor's-edge theater of global brinkmanship, the world has come closer to annihilation than most ever knew.

Step inside the hidden areas where history was steered in secret. From Churchill's wartime bunker - complete with a direct line to FDR concealed inside his private bathroom - to a Soviet weapons base in the desert.

David Duchovny exposes a clandestine nuclear blast set off deep below Mississippi soil, and secret experiments conducted on citizens in the New York subway system.

A French Resistance operative hides explosives in baguettes to cripple a Nazi factory, an American soldier parachutes behind enemy lines to destroy critical supply routes, and Ukrainian forces deploy AI-guided drones to strike a Russian bomber fleet.

From a British scheme to launch airborne balloons against Nazi Germany, to American bats fitted with incendiary devices, to a covert effort to manipulate monsoon rains in Vietnam.

A stranded American pilot in Vietnam is rescued through a code built around familiar golf courses, while Navajo Code Talkers transmit messages that help turn the tide in the Pacific during WWII.

Behind official policy often stands unofficial actors. Discover the audacious operations of Red Cell.

Follow the secretive flights of Project Argus, that sent nuclear warheads into space to test whether radiation could cripple Soviet weapons, while Operation LAC covertly released chemical agents over American communities to simulate biological warfare.

David Duchovny takes us into the long-spun elaborate tales governments have employed to blanket their boldest missions, showing us how the illusion works - or until it doesn't.

In Operation Halyard, villagers and resistance fighters built an airstrip by hand to spirit stranded airmen out of Nazi territory, while Operation Mount Hope saw American forces steal a Soviet helicopter from the African desert under cover of darkness.

To outmaneuver the enemy, you have to sell the illusion. An FBI agent goes so deep undercover he's best man at a Mafia wedding, while the Stasi deploys a covert network of charmers across borders to win trust and steal secrets.

Some missions are so risky, they're denied before they even begin. These operations are proof that the most dangerous missions are often the most unthinkable.

Sometimes when governments can't negotiate their way to victory, they steal it. When the KGB sets its sights on a NATO missile, they enlist a smooth-talking German playboy armed with only a wheelbarrow, a carpet, and a postage stamp.

When conventional tactics fail, governments have been known to test the boundaries of reality. These are the moments when governments went looking for solutions beyond the limits of traditional thinking.

Some deals are made to announced headlines, while others are steered in the shadows. While the fingerprints may be hidden, the consequences of every deal leaves a lasting mark.

Some strongholds are built to defend a nation, others to survive its darkest hour. From deception to survival to espionage, these hidden sites reveal the lengths nations go to when the stakes couldn't be higher.

Every spy needs a cover story - and the best gadgets have one, too. In the jungles of Vietnam, the U.S. military built sensors that could sniff out hidden enemies. Sometimes the most dangerous weapon in the room is the one nobody realizes is there.

Before they became instruments of war, they sounded like impossible ideas. An American medical student develops a closed-circuit rebreather that allows Allied frogmen to slip beneath enemy harbors without a single bubble.