Can't find the key for the door to reach the Oculory in Skyrim? Here is a video showing how to do it.
**If you need help with the puzzle at the end see my other post HERE
Basically, just go the opposite way from the door, keep going till you get to a room where you can't go anywhere else. In that room there is a chest which contains the key.
Quest: Revealing the Unseen
-Reach the Oculory
-Search for Synod researchers
-Find the ruins of Mzulft
-Speak with Mirabelle Ervine