Elder Scrolls

Unfathomable Depths

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Unfathomable Depths
Unfathomable Depths
Quest Giver From-Deepest-Fathoms
Reward Ancient Knowledge active effect.
Type Miscellaneous Quest
Quest ID MS04
Unfathomable Depths is a quest available in The Elder Scrolls V: Skyrim.


Notable itemsEdit


Riften DocksEdit

The Dragonborn will find From-Deepest-Fathoms wandering around Riften's docks. Upon first meeting her, she seems despondent and paranoid, immediately wanting to give the Lexicon over to the Dragonborn, pleading for it to be returned to the Dwemer Ruins of Avanchnzel.

Return Lexicon


Upon arriving at Avanchnzel, four transparent orange figures will be standing at the bottom of the first large open cave room. These are the 'ghosts' of four adventurers (or "thieves", in their own words, and none of them can pick a lock), who went to Avanchnzel to recover/steal the Lexicon.

They will reappear throughout the quest and the Dragonborn can overhear that the two human characters had little knowledge about the place or item of interest, but From-Deepest-Fathoms and Watches-The-Roots were very familiar with both and persuaded them to stay and complete the job against their better judgement. The two human mercenaries stay, only because the job paid well, but it becomes clear that the Argonians sought out the Lexicon for the knowledge it housed.

When following the marker along the corridors, the ghosts will reappear along the way. Dwarven Spider Workers, Dwarven Spider Guardians and Dwarven Spheres are found on the way.

Avanchnzel AnimoncultoryEdit

Fight the Dwarven enemies and continue forward up the stairs and corridor, passing a tent with four bed rolls used by the adventurers when alive.

Unfathomable Depths 01

Beware of the trap when opening the door on the right in the next room. Continue through rooms and doors, eventually coming to a large room with two Dwarven Centurions on large stone tables.

Unfathomable Depths 02

In the next room, one of the adventurers, Drennen, is lying dead on the floor. He left the group for unknown reasons.

Avanchnzel BoileryEdit

Upon entering the boilery, the three remaining ghosts talk about the lexicon and what to do with it. Moving forward through rooms and corridors, the ghosts reappear before a door and they are in a hurry to reach the Receptacle. In the next room, there is the second dead explorer, Watches-The-Roots.

Unfathomable Depths 03

Finally, through the last door, there is a large room with Breya, the last of the explorers, lying dead on the floor. A Dwarven Centurion is guarding the Receptacle in which to place the Lexicon. This Centurion can easily be defeated by luring it into the spinning blade trap in the last room.

Upon activating the receptacle, the Lexicon will be removed from the inventory and open. The Dragonborn will be rewarded with Ancient Knowledge, a permanent bonus. The Quest will now be completed.

Leave by the door behind the Receptacle and go through the barred doors and out to the Avanchnzel Balcony for a faster exit and a locked chest with some loot.

This dungeon is not accessible before the quest has been activated (Dungeon Lock Outs).



  • From-Deepest-Fathoms will not appear until the Dragonborn has reached level 14
  • Pickpocketing or just taking the lexicon from From-Deepest-Fathoms and then placing it back in her inventory will cause her to still act as though the Dragonborn still has it and will say "No, It's yours now, I won't take it back I won't!," even though she has it in her inventory.
  • From-Deepest-Fathoms is the only person it can be placed on.
  • From-Deepest-Fathoms is not marked as an essential character so she can be killed if attacked. The Lexicon will still be in her inventory after she dies.
  • Stealing the Lexicon only results in From-Deepest-Fathoms turning around and talking as if the Dragonborn has done her a favor in beginning the quest.
  • From-Deepest-Fathoms will give the Lexicon to the Dragonborn even if he/she is in the water and not on the docks.
  • If any Dwemer weapons, such as the Dwarven Bolt, are taken, a letter will be sent from Calcelmo through a Courier stating he wants the Dragonborn to bring one to him in return for a large payment. This will begin the quest Letter from Calcemo.
  • It is easy to become stuck in the southeast corner of the room in which the apparitions discuss whether the Dwarven automatons were sleeping or waiting.


This section contains bugs related to Unfathomable Depths. Before adding a bug to this list, consider the following:

  1. Confirm all bugs with other editors on the talk page before adding them below.
  2. Always try reloading an old save first, before asking for assistance.
  3. Do not discuss possible bug fixes or origins. Leave those and all other first-person-anecdotes on the talk page, not the article.
  4. Always add  360  ,  PS3  , or  PC   to clarify which system the bug appears on.
  •  360   Not necessarily a bug, but occasionally, when swimming near the docks in Riften, you will be addressed by From-Deepest-Fathoms, who irritatedly asks why you are bothering her. However, in the subtitles, her name only shows up as Fathom.
  • There is a rare chance that in the Avanchnzel Boilery's first ghost encounter, From-Deepest-Fathoms will not say the last line in the conversation and the ghosts do not vanish. When the next few ghosts appear, they do not say or do anything and stay put. This does not affect the quest, but it's also interesting to note that the Dwarven Centurion ghosts show up as enemies on the compass and the real Centurion cannot walk through them.
  •  360   Saving before entering the Boilery is advised as it is prone to glitch and lock up while in the loading screen.
  • Whilst in the Boilery there is a chance that a Dwarven Spider will spawn under the grated floor in one of the corridors, but it cannot hurt you and vice versa. However, it may stop you from clearing the ruins. To fix this simply open up the console and type 'killall' whilst standing above it, or by using Blizzard while standing directly above it. Another way to easily kill it is using Chain Lightning.
  •  PS3    360   When entering the first room with the Dwemer Spiders and attacking with bow and arrow, the arrows pass straight through them and they receive no damage.

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