A liquid fueled ICBM, a Soviet Era Sub designed more than 50 years ago and seawater!!!! I mean what could possibly go wrong here.
Hey, N Korea,....I hear Orbital Sciences has a great deal on some Russian NK-33 rocket engines, which are the same vintage as your Russian sub. What a match! Opportunity knocks.....
Yeah, liquid fuel for missiles is universally nasty stuff. “Energetic” unstable, short usable lifetime, poisonous, corrosive. ... Not the kind of stuff I’d want to be sealed up in a steel tube with. Especially a 50 year old soviet steel tube.