Nuclear submarines typically refers to the powerplant, though for the US that is pretty redundant since all active US sub's are nuclear. Many or all of those subs are capable of carrying nuclear weapons though. The US historically has tried to not talk too much about where they have nuclear weapons deployed. This regime may not have that level of discretion, and honestly probably doesn't actually know what nuclear submarine even means.
As for the rest, they are literally out murdering people in international waters to distract from how dog shit their government is.
GrapheneOS does allow you to turn it off. It has a permission switch for your phone sensors. I don't know if there are other versions of android that allow the same.