The Great Lift at Raldbthar is an ancient Dwemer mechanical lift that connects to Blackreach. The iron gate will initially be locked, however, it can be opened from the other side by pulling the lever next to it.
To reach the other side the Dragonborn requires access to Blackreach, the only way to do this is to have started the quest, "Discerning the Transmundane", as Septimus Signus' attunement sphere is required to open a door to Blackreach.
From Blackreach, the Dragonborn can ride the lift up to the surface and open the gate, after which the lift can be entered from the outside anytime it is travel to and will appear on the World Map, separate from Raldbthar.
This section contains bugs related to Great Lift at Raldbthar. Before adding a bug to this list, consider the following:
The gate may close itself at any point after being opened and returned to. When this happens, the other gates will close as well and enemies in the ruins and Blackreach will respawn.
- It is possible to circumvent this problem and still get into Blackreach. By standing against the gate of one of the above-ground lifts and casting Summon Arvak, it is possible to get through the gate by mounting and then unmounting Arvak. You can then use the lever to open the gate and descend into Blackreach. Note: If it worked correctly, Arvak will appear to be halfway through the gate.
- Another way to circumvent this is by standing at the gate and holding a plate in front of you and running into it. You must move the plate around to find the correct spots that allow you to move through the gate.