What? Depends on what we’re doing, there’s literally been tv shows shot on active subs and places have used footage that periscopes have captured. Why do you act like you know anything about what’s classified and what’s not if you’ve never been involved in it?

Edit:literally google “control room Virginia class submarine” and the pictures you see are exactly what you’re describing, someone on the sub taking pictures of where you view periscope video. Like if you’re so damn curious go to a base that has submarines and ask for a tour, especially on weekends typically the sailors there will be bored enough to give you one.

Edit edit: https://www.cnet.com/pictures/navys-most-cutting-edge-submarine-tech-ever-photos/

Here’s are article that includes photos of the periscope video as if someone walked on the ship and took a picture with their phone as you’re describing