The tunnels are extensive, room after room, stairs and ladders up and down, each of the five or six turrets linked by underground passages that make unexpected turns and lead to surprising places. There were sleeping rooms, common rooms, headquarters, fireplaces, a kitchen, a machine room, and even a half-dozen saunas in true Scandanavian style. We played and explored for over an hour, and for some members of our group this visit was not only the highlight of the trip, but the highlight of their Norway visit.
The pictures below just don't capture the sheer awesomeness of this place. If you're visiting Trondelag, put this on your must-see list. Here's the link to our last visit with a lot more pictures.