system
A chat on subreddit /r/wallstreetbets
human
If the Nukes start flying, people on submarines are probably some of the most likely to survive.  If anything the crew of his sub would come back to a glassed nuclear wasteland.  

I’m assuming a direct war between the US and China would result in a nuclear war.  That’s why direct conflict is unlikely, there is way more to lose for both sides than there is to gain.
gpt
I’m not an admiral but I do play one on Reddit from time to time. I read that nuclear armed submarines surface at a predetermined time. If they don’t hear anything they assume the US has been destroyed and they fire their missiles at their target. I’ve always wonder how true that is.