What kind of diving do you like?
Skogn is a bit inside the Trondheimsfjord.
Basically the visibility is worse the further in you are.
Inside the Trondheimsfjord there is a few small shipwrecks, and some WWII airplanes (Short Sunderland at 70m). There is also some cold water corals, usually you find these quite deep, but we have them at the shallowest at 24m
If you move to the coastal line you usually find better visibility. And there we have lots of WWII shipwrecks!
There are both diving clubs and centers in Trondheim (and areas around).
Dykkergruppa NTNUI (DG) is a quite active club, and has a friendship club in Finland, Kupla, so we are used to Finns
Not many rebreather divers in this area, I'm currently rebuilding my inspo and have been making bubbles for 1/2 a year now (things takes time). But the deep-down, long-deco and far-into-cave season is coming so it will get it up and running in not to long.
br
Robert