There's a set of sealed gates inside that the ghost you help during Lost to the Ages mentions as you walk past them.Any idea on how to open them? And no, they're not the massive multiple tonal locked ones.Looking at the dungeon map of Arkngthamz, the sealed gates I'm wanting to open are located at the southern end.

There are some gates locked with the same Type of "propellors" as the tonal lock. Just look for those in the room that you are stuck in.

There is a hidden...ish tunnel/corridor close by if your in the location i think you are. face the locked doors and turn right, walk to the edge of the ledge and look down, if you see a large dwemmer statues head make your way down to it once at the head stand on its right side and look away from it, above you are ledges which you can get to somehow climb/drop down i forget how i did it i think a pipe maybe close by... whatever the point is the entrance is there it takes you behind the doors to the loot and a switch to open the doors is there too.

Make sure you google which order to do the tonal locks, or get the in game journal with the answer or it will spring traps and kill you.

Well you can just perch up on the path, spring all the traps destroy all the enemies and then do it the right way, you get more loot that way.

I agree, spring the traps, get the loot.