@reaper- just to be more clear about what happens, the attack scope is fine, so the problem is only with the obs scope.
After starting a saved game, there is no problem with the scope being in the down position until such time as you use it, and then the problem of it rising continues to happen until you stop the game and then restart again.
Also, when using the obs scope, at periscope depth, it remains just below the waterline when using the up / down buttons new in your interface.
The only way to then see above the waterline is to use the page up key to raise it further and raise the sub to around 10 metres depth.
I remember this issue happening in SH3 once with a new mod but cant remember which one it was.
Otherwise this is great work and I am really enjoying it thanks.
