Unfathomable Depths

Unfathomable Depths is a quest in which Septimus sends you to Dwarven/Dwemer ruins to get a blank lexicon inscribed with the knowledge of the long-dead dwemer race, so he can use it to open a mysterious box in his stronghold in the north of Skyrim.

Your journey will start off at a research/archeology site from which researchers (or possibly looters) have been taken by the Falmer (goblin-like elves) deeper into the ruins. As you progress you will experience new traps, and the journey ends in a new puzzle where you use a large complex dwemer device to inscribe the lexicon, and in the process, retrieve the Elder Scroll needed to learn Dragonrend.

Notable Loot:
 * Elder Scroll
 * Lots of Dwemer parts which can be smelted.
 * Lots of smithing ores and ingots.
 * Runed Lexicon