Talk:Echo/@comment-25176701-20150501010120/@comment-26247132-20150504220641

They'd have to be within a certain distance of the Mountain, otherwise the Clans would have had no reason to unite against the MM. The O2 tanks only held 12 hours of air so short of bringing spare tanks with them everywhere (which we didn't see), they could only travel within a 6-hour radius (by foot, I'm assuming because we also didn't see seen any other travel devices the MM might have used).