I've written before about some of the diving in Norway. When working in the North Sea several years back, I did quite a bit of diving there. The Saltstraumen Maelstrom has the fastest tidal currents in the world and since I love drift diving I've dove this and the Sunstraumen Maelstrom quite often. The normal currents for diving are 3 to 5 mph, but the current does get as high as 25 mph in spots. What a hoot! 
