Board Thread:Lore Discussion/@comment-25531876-20141229215535/@comment-15271256-20150103190722

I realize numerous in-game sourced are simply terrified of a Falmer invasion, but they're just overreacting. If the falmer are dumb enough to be killed by dwemer traps they've lived around for centuries, but also smart enough to avoid them and go to the surface, the conclusion is wide open.

As is often said in cases like this, the answer may never be known for sure.