Unfathomable Depths

Unfathomable Depths is a side quest in The Elder Scrolls V: Skyrim.

Overview

 * Prerequisites: None.
 * Quest giver: From-Deepest-Fathoms - Riften Docks
 * Reward: Ancient Knowledge (Permanent Bonus - 25% bonus when wearing Dwarven Armor, Blacksmithing skill increases 15% faster).
 * The Ancient Knowledge perk is currently bugged; The bonus to Dwarven Armor does not work as listed, instead seeming to enhance armor rating from ALL heavy armor, rather than only dwarven; This commonly leads to the assumption that the effect doesn't work at all, since the way one would expect to see it change is by comparing armor rating before and after equipping. Also, instead of making the Blacksmithing skill increase 15% faster, it actually fortifies Blacksmithing.
 * Reputation gain: N/A

Objectives

 * Return lexicon to Avanchnzel

Notable Loot:
 * Lots of Dwemer parts which can be smelted.
 * Gems and Soulgems looted from enemies.

Walkthrough
The Dragonborn will find From-Deepest-Fathoms wandering around Riften docks. She seems a bit paranoid at first, but eventualy the Dragonborn will find out that she has been to the Dwemmer ruins of Avanchnzel and gives the Dragonborn a lexicon before he/she can say anything about it. Upon arriving to Avanchnzel five orange figures will be stanging there. These are the ghost of five adventurers, and they where sent to Avanchnzel to recover a lexicon. In time the Dragonborn will find out that none of them acually want to be there, but From-Deepest-Fathoms Persuades them to stay and complete the job. They stay, only becasue the job pays so well. Along the route to the lexicon the Dragonborn will find three bodies, from three dead adventurers. Meaning only From-Deepest-Fathoms made it out alive.