Thematically it’s a pretty badass location to cap off the adventure, like a “what if”-scenario where U5 didn’t assassinate Bodvarr and the Pact Sworn did discover your HQ and lay siege while your team tries to survive for as long as possible.
The map itself is rather expansive with lots of layers. And Fat Shark could have some fun by leaving tons of traps players can activate like trap doors or dropping rocks, or board up windows and gates like in the warehouse section of The Pit.
And instead of tracking team progress based on waves, it’s by points earned from killing enemies until inevitably dying as the entire point is to take as many with you going down.