If you go swimming under that little crevice, you'll find some loot and a shortcut to other parts of Glacial Crevice | Elder scrolls games, Skyrim, Elder scrolls
Skyrim:Glacial Cave - The Unofficial Elder Scrolls Pages (UESP)
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Skyrim:Glacial Crevice - The Unofficial Elder Scrolls Pages (UESP)
Karstaag | Unmarked missions - The Elder Scrolls V: Skyrim - Dragonborn Game Guide | gamepressure.com
Glacial Cave - Skyrim Wiki
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