Hopefully ye put down a fair number of the mongrels while you were in there. Shame about Cornelius, though.
From what you described, there's not much to report other than the cave is a lost cause. Whitebeard's not gonna like that answer, but I'm not darin' sendin' anybody else into that death trap.
Feel free tae pass along the message, <name>. I'm not leavin' this spot till the mountain's secure.