It is the location of one of two oculories in skyrim the other is deep underground in blackreach and this feature in particular made it a target of a secret project conducted by the synod.
Skyrim mzulft aedrome locked door.
Access to virtually all of the three zoned main ruin is blocked by a locked door which cannot be picked until you begin the college of winterhold quest revealing the unseen.
The first locked door s key is through the door on the opposite side of the room.
This can be fixed by shouting at him and if that does not work try reloading and making sure he opens the door.
Having trouble finding the key.
In the mzulft aedrome after paratus decimius opens the door to the oculory he may stand there even after telling him about the focusing crystal and he expects to be followed.
Opens a door leading toward the mzulft oculory from the main section of mzulft aedrome.
This ruin cannot be explored unless the dragonborn has been sent here by mirabelle ervine to retrieve the staff of magnus as part of the quest revealing the unseen because the key required to unlock the inner door after entering mzulft is found on the body.
Mzulft is an extensive dwarven ruin south southeast of windhelm along the main road between windhelm and riften.
It is found along the western side of the mountains of eastmarch.
Defeat it and the key.
Go all the way to the end of that path and there will be a boss that depends on your level.
Mzulft boilery in a master locked room it can be grabbed with telekinesis through the bars without entering the room opens the door to the room it is in and an expert locked door a little further along in the boilery.
Or you could hit the tilde key in front of the locked door click on the door and type unlock if the door was targeted in the console it will say unlocked door of course thats just for the pc.