Board Thread:General Discussion/@comment-66.85.227.68-20130716204920/@comment-173.245.153.237-20180321215318

Easy way to enter on switch:

You'll need to have enough magika along with the "Summon Arvak" spell from Dawnguard. If you enter through the main gate and go all the way to the right, you can jump onto a wall with an invisible barrier. From there, summon Arvak on the other side and ride him. Boom! You're in.