Your periscope might have been destrtoyed. Otherwise it works just fine from periscope depth, or above.
Try this: while on the surface, press the raise obs periscope button and wait. Switch to obs periscope and see if there's any change at all. Try pressing Insert while you are looking through the scope. If there's no change, you might want to check out the damage control pannel: you might have lost your scope in a recent attack.
If that's not the case you've got some graphical glitch on your hands.
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