while going through the yashazmus dungeon I found a hole in the cave ceiling in the yashazmus, shrine cell which I could just fly right through and into the void it can be found by coming in through the door from yashazmus, outer halls walking forward in a straight line till you have to turn then looking up at the two suspended daedric mist lantern thingies fly up to the right one with levitation walk along the lantern suspension arm called ex_dae_pillar_01 in the console till you're touching rock and look up and you should see it I've attached an image where I'm standing where I said to stand when looking up and circled the suspension arm to stand on and drawn an arrow pointing to exactly where to stand as I don't know how to get coordinates sorry