Many ages ago, the great Nordic hall of Djupsgaard and its warriors ruled over all Solstheim. Built around the great earth-tree Jarngren, the hall was a haven for all and sundry against the fierce elements and creatures of the island. Some say the hubris of its warriors angered the gods, as an earth-shattering earthquake saw it suddenly disappear deep below the ice of the Northern wastes and into legend.
Now rumours abound throughout Solstheim of a great hall far beneath the permafrost, whose ancient dead do not sleep....

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This mod adds a rather huge underground Nordic hall to the north of Solstheim. It's designed mostly as a house-type mod, but it might be worth a visit anyway. There's also now fun quests to keep you busy for a bit. To find it, try asking around at the Skaal village, they hear a lot of rumours...