everything on a sub will kill you, or save you..
https://foxtrotalpha.jalopnik.com/watch-this-nuclear-sub-blow-its-ballast-while-still-in-1569469199#:~:text=What%20you%20are%20seeing%20here%20is%20a%20rare,event%20such%20as%20a%20fire%20or%20battle%20damage.