Mysterious signals. High-speed underwater craft. The Soviet Navy’s most classified encounters with the unknown beneath the waves.
During the Cold War, Soviet submarines and naval intelligence units frequently encountered unexplained phenomena beneath the ocean’s surface—objects moving at impossible speeds, unidentified sonar contacts, and the eerie sounds of the so-called “Quackers.” Were these secret NATO technologies, natural anomalies, or something far stranger?
In this episode of Hangar 51 Files, we dive deep into Soviet naval archives, declassified KGB reports, and firsthand accounts from submariners to unravel the mystery of USOs—Unidentified Submerged Objects. From the chilling reports of “swimmers” in Lake Baikal to the Arctic anomalies that defied military explanations, this is a Cold War story like no other.
Join us as we separate fact from speculation and uncover what the Soviets really knew about the unidentified forces lurking beneath the waves.