Strange dead end?

[Wildly Mild]

Inside of blackreach, I occasionally run into these dead ends, Very peticular walls that have three symbols on the ceiling. they're kind of strange and i wonder if there is something more to them. Especially since i found one with mobs behind it.

http://i.imgur.com/4R91W0L.png The only door in that room besides the entrance leads to that dead end, Surely theres some trick behind it right? Ive tried hitting the symbols with arrows and spells, And theres no levers. This may or may not be caused by one of my mods, I really dont know, and i cant find anything on google.

[KiraTsukasa]

I believe those are entrances to Blackreach from the Dwarven ruin above, the ones you need the tuning device to open.

[SpeedFreak1972]

Yea could be They are only accessible from the other side

[Brandybuck]

I thought those entrances had levers on the Blackreach side? I know at least two do, but maybe not all of them.

p.s. I once retrieved Grimsever by going through Blackreach...

[Rocket]

yah pretty sure thats one of the round staircase encased in stone, it gets lowered once you use a lever on the other side

[Dexter]

You must go to the Septimus Signus Outpost NW of the College of Winterhold for the Attunement Sphere.

I usually go get the sphere asap becauseI like to go mine Soul Gems in Blackreach, so I can raise enchanting. The sooner I can go the sooner the zone respawns. It is a high level zone though and requires a follower. Barbas at level 10 makes it alot safer.