00:00Nine experienced hikers entered these frozen mountains, but none of them ever returned alive.
00:06What happened that night remains one of the world's greatest mysteries.
00:09In February 1959, a group of hikers camped in Russia's Ural Mountains.
00:14During the night, they suddenly cut their tent open from the inside and ran into the freezing wilderness without proper
00:19clothing.
00:20Some believe it was an avalanche.
00:21Others suspect secret military experiments or something far more mysterious.
00:26The truth may never be known.
00:27What do you think happened?
00:28Comment your theory below.
00:30Comment your theory below.
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