I was looking for quests that I might have missed and I stumbled upon this

"There is a series of well hidden quests in Skyrim that will allow you to access the "area" that the Dwemer are currently very much alive within. So far, according to hidden Steam achievements, only 2 people worldwide have discovered the quest chain. No one has completed it yet. It is unlikely that the people who have discovered it have even realized it, as I haven't seen any public discussion about the quest chain yet.
The quest chain is not expounded upon in the official strategy guide.
The quest chain is not randomized; it is accessed via a very specific set of player actions.
The quest chain will not begin until you've completed a more well-known quest chain.
The quest chain requires that two specific weapons be upgraded to their maximum.
... The quest chain features a sound puzzle. You won't even be aware of the puzzle's existence if your sound is muted. This may or may not be the reason why so few people have discovered the quest chain.
We intentionally left this quest chain out of the official strategy guide in order to encourage old school word of mouth "secrets".
This is why we've delayed the Creation Kit."

I'm almost positive this isn't in-game but I also heard a rumor that this could be future DLC. After seeing this it got me incredibly interested in Dwemer lore and the story about their mysterious disappearance. I have been obsessed with them ever since finding out about this. All this got me thinking about how amazing the developers really are and how they have literally created an entire race with a full history and cultures for them. I honestly think this would be some of the best DLC ever if it were to be released

Jeez I'm sorry. I should really look at other threads before making them. Won't happen again haha

Someone would have already found mentions of such questline in the game's files.

I know it's not real but I'm just saying that would make for some superb DLC