Reading Sanamia's Journal (2) found in Broken Tusk Mine starts this mini excavation.
Walkthrough
The collapsed chamber is located in the Valthume Catacombs. Activating the site leads to the rubble being cleared (takes about 12 ingame hours). After defeating the Draugr Overlord that appears in the excavated area, you can loot the Burial Urn for an Atmoran Bronze Seal and the adept-locked chest (beware of the spear trap pressure plate) for random loot.
Location
Valthume Catacombs
Quest Stages
Sanamia's Journals - Valthume (DBM_JournalDungeon02QST) | |
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Stage | Journal Entry |
5 | I found one of Sanamia's journals which spoke of a visit to honor the dead in Valthume and mentioned that several chambers were completely collapsed. Perhaps if I clear these areas there may be something of use.
Objective 5: Excavate the hidden chamber |
10 | I have cleared the rubble in Valthume. I should check the area to see if there is anything worthwhile. |