Did Germans have any kind of rocket launchers mounted on U-Boots in Norway?
According to the booklet, aerial photographs taken in the autumn of 1944 in Norway showed strange installations on some U-Boot decks. British analysts considered them as rocket launchers, Americans - as devices for loading torpedoes.
In early march 1945 a spy team codenamed Oyster, acting in Norway, radioed London, they had managed to take several pictures of German U-Boots in Bergen, with rocket launchers on decks. These pictures were urgently delivered to England via Sweden and the devices were recognized by British experts as launchers for medium range rockets indeed (whatever "medium range" could mean those days

Experiments with the U 511 in the Baltic sea are well known, there were some rocket armed Typ II submarines in the Black Sea, there were some submarines with 8,6 cm AA rocket launchers... But were there any other submarines in service with water-to-ground rockets?
I'm completely aware, the book is rather uneven - there is a lot of very reasonable information, while there are nearly fictional parts too. And so I just wonder, what is the case with the above information on the rockets.

Kind regards
Grzesio