That video and channel are also fun, but I meant this one from xkcd’s What If channel about a baseball moving at 90% the speed the light:) Hopefully that’s a new one for you because (obviously) I liked it quite a bit.
I feel like the battleship Yamato in the documentary Star Blazers has already demonstrated that it is completely viable to launch a naval vessel into orbit and have it perform with excellence.
Just as a note, though - nukes in space work completely differently than nukes in the atmosphere.
I think they also have an EMP effect that can damage ship/sat electronics.
But, like the internet, a sub is a series of tubes. You have a big horizontal tube that the people and the engine lives in, and you have vertical ones where the things that blow up cities live.
I mean, there are optional smaller horizontal tubes, but I feel like if you’re going to launch a sub into space it really ought to be one of the big ones. Maybe it’s just a Freudian thing.