[Spaceships] Orion space drive: launch from underwater?

[Flyndaran]

Originally Posted by Ulzgoroth

Yeah, there's certainly room for the ship to require some above-water work before it can launch. Or even a whole lot of work...there are a number of rocket components that should really never be immersed in seawater, I'd think. (They could be manufactured underwater in 'dry chambers', but would have to be transported to the surface in sealed containers.)

Glad to be of use

Don't real world rockets often have cowlings discarded after exiting the atmosphere? Underwater launches would just require tighter seals.

I doubt pusher plates need that much protection and being by far the largest component of an Orion ship...