Morrowind Easter Egg - The "Real" Mournhold?

As you may know, you can get to a place by typing coc "whatever," try that with Mournhold, if you try that it will take you to a secret little room which may have just been a test room or something. It's a small room with a door that gets you to an endless black place. Divine and Alimsi intervention don't work here, and I think the only way out is via coc "Balmora." It is possible this only works if you type coc mournhold as opposed to coc "mournhold" or the other way around. I'm not completely sure. Try it out!