This is a pretty interesting video. It’s an older Type 033 Romeo diesel-electric boat used for training. It’s technology from the 1950s, but the Chinese built them well into the 1980s.
A couple thoughts. Voice pipes! Who still uses voice pipes? And isn’t that a little problematical from a water-tight integrity view?
Second, the food looked really good. But not having a proper mess deck is really weird.
The video is for domestic Chinese consumption, so of course the PLAN comes across looking pretty good.