In 1993, six hikers in the Khamar Daban mountains near Lake Baikal suddenly collapsed with horrifying symptoms—foaming at the mouth, clutching their throats, reports of bl**d from eyes and noses, and even smashing their heads against rocks—while one teen girl fled and survived to tell the story. Officially, autopsies listed hypothermia (and a heart attack for the leader), but the bruised lungs, rapid collapse, and chaos have fueled theories of hidden nerve‑agent testing, toxic water, or some unk