Nine hikers, led by Igor Dyatlov, died overnight February 1-2, 1959. The tent was cut open from inside; footprints in socks led downslope to a cedar where two bodies lay by a fire; three more were found climbing back toward the tent; the last four, in a ravine, had skull and rib fractures like car-crash injuries, with no external soft-tissue wounds. Two victims' clothes showed trace radioactivity. Theories for six decades: Mansi attack, military test, infrasound, yeti, lovers' quarrel, orange spheres in the sky.
The reopened Russian investigation, 2019, offered avalanche, slab avalanche, or hurricane. In 2021, two Swiss researchers modeled an atypical small-slab avalanche: the hikers cut into the slope under a shoulder for their tent, katabatic winds piled snow onto a hidden weak layer for nine hours, and a 16-foot slab released after midnight, crushing rib cages against the ski-reinforced floor at car-crash force, with no powder-snow runout, matching the half-collapsed tent, the escape in panic, and the paradoxical injuries. The radioactivity traces and the failed rocket, which flew 1,500 km the other way, are documented red herrings.
The claim: Dyatlov Pass persisted as a mystery not because evidence was missing but because the mundane answer arrived last, and sixty years of yeti books and UFO documentaries had already been printed; the classification culture of 1959 taught the public to assume concealment, so every ordinary answer reads as cover. Verdict: the Soviets' own secrecy habits manufactured the suspicion, same as the archive's Mockingbird file. The hikers cut the tent. The state cut the trust. Only one of those wounds healed.
If it was just an avalanche, why did the file stay classified for decades?