Drethos Ancestral Tomb
www.nexusmods.com
This mod adds a new dungeon to the Bitter Coast Region: Drethos Ancestral Tomb. Ancient and forgotten, it hides a sad story about loss and grief. Will you find your way through root and rock to uncove

Just randomly came across this quest in my latest playthrough and its spectacular. If you are gonna do a Morrowind playthrough put this in your list but do yourself a favor and ditch the boots of blinding speed.