One thing that has bugged me about Yagrum Bagarn was that he escaped the fate of the Dwemer by being in some "Outer Realm" at the time of the Grand Incident (or whatever is the technical term). I've always been curious by these "Outer Realms." Was he in some plane of Oblivion? Was he on one of the dead Aedric planets? Or does he use 'realm' in a more medieval sense, i.e. was he in Yokuda, Atmora, or Akavir?

Perhaps the more appropriate question to ask: Has there ever been any explanation on these "outer realms" outside of Yagrum's dialogue?

The best explanation I know if is in http://imperial-library.info/content/pocket-guide-nature-places-not-here.

Ah, thank you for that. That helps quite a lot.

It raises another curiosity within me, though. How does one find an Outer Realm? I guess you can't really load up in your Class 3 Dwemeri Void Voyager and find it, can you?

Magic, Towers, Advanced Conjuration theory, the Pillar of Light.

Take your pick.

You forgot Vehkships, and whatever it is that the Sunbirds/Mananauts use

I so wanna DLC/Mod involving Mananauts

And me wants ASSN-engines, C0DA data banks, KINMUNE and other awesome technologies.
In Russia we call it CHIMpunk.

CHIMpunk: Skyrim DLC, coming soon.

Alvin and the CHIMpunks: The Squeak Breaks?

Also, thank you for the useful information.

Okay, wtf is a Vehkship.

Sunbirds are the Aldmer spaceships, right? I did a TIL search and found nothing, but random forum posts.

Loveletter.

Just a forum post.

http://www.imperial-library.info/content/forum-archives-michael-kirkbride

The Mananauts and Sunbirds are elaborated on in the http://imperial-library.info/content/pocket-guide-empire-third-edition-magic-aetherius.