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.