Yep, it really does, I promise!

Though the route Marius took out of the Dragonsreach dungeon to get there is part of the Skyrim Sewers mod. He’s escaped from Dragonsreach before and ended up somewhere with guards, not with
surprise skeletons.

Marius popped up through a loading screen from that hatch in the floor.
The quest was to go find the priest Andurs’s lost Amulet of Arkay. Andurs says he’d go look for it himself but he’s heard scary noises coming from the catacombs. Marius is not an overly helpful fellow, but he felt responsible for waking up the skeletons that were scaring Andurs when he slipped through there with the circlet he had just stolen from NPC Jerric (for real) in Dragonsreach.