Board Thread:General Discussion/@comment-26415383-20170330192005/@comment-27819070-20170331072953

Mountain Men definitely weren't from the bunker. Their ancestors were in Mount Weather when the nukes hit, and so they are completely separate from the grounder clans. Mount Weather didn't even know that the grounders existed until decades after the apocalypse, and the Mountain Men identified them as Savages and Outsiders... noting that they had lost their advanced and technological heritage. Mount Weather and the Clans are from completely separate blood lines, explaining how the Mountain Men didn't breed into the radioactive immunity of the grounders.