This museum is actually several museums in one. It combines the history of mining in Kongsberg with the weapons manufacturing and marine equipment that still play valuable roles in Kongsberg. There is also a ski museum. It was an interesting stop with a lot to do.
Pro tip: make sure to try every door. There are a lot of rooms that look "off limits" that are actually treasure troves of fun. Were they off limits? Maybe. But we investigated anyhow. Great information and history.