Well, maybe ...
Ive just read about an study suggesting to install an RMK 30mm recoiless gun into a retractable mast of the type 212 u-boats.
Somehow i sense Socko's handwriting on that one.
It is also mentioned in this wikipedia article
Mause RMK30 gun
Here is pic of the gun. Normally it is tank weapon
Additionaly ive found a video that shows the first test of the Iris-T missile.
The seeker you see on this missile will be used for the IDAS AA missile that is in development for the type 212.
It functions just like an human eye.
Imagine you sit in an anti-submarine helicopter or airplane and suddenly this baby comes out of the waves and starts...........
looking for you
It will have an laser optical wire just like torpedoes have which enable the operator aboard the u-boat to guide the missile into its target if required.
Iris-T @ wikipedia
Iris-T missile test video
I would'nt be surprised if the IDAS version has a single.......BRASS BUTTON EYE