In the darkest years of the Cold War, the Soviet Union wasn’t just racing for power… they were experimenting with the limits of the human mind. One secret base in Siberia, buried deep in the snow, was said to test how long soldiers could survive in isolation. The world never heard of it—until the survivors talked. The Soviets locked a group of young men underground for 15 days with no sunlight, no clocks, and barely any food. They wanted to see how long the mind could handle total darkness. By d

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