Okay, in retrospect, me asking the thread if Morse code is a thing was hilarious. I figured it likely someone had asked, but I didn't expect Boney to have answered that exact question like 10 times at least lol.
This update was great. I love how the rescue appears to others looking in too:
"Grey Wizard rolls up, asks for angry dwarfs to set up some shade for her, theN proceeds to somehow teleport 300+ dwarfs with a boulder and a length of chain."
I bet most of Okral desperately want to grumble about zhuf nonsense but don't want to appear unhappy about saving so many survivors! Can you imagine the mixed feelings? Hilarious.
The only other idea I can think of for further rescue (other than the Morse bandwagon) is to use an Ulgu PS to super charge Pall of Darkness thru the steel of the ship. I don't know what radius such a spell would have though. Depends on how many sealed doors are near each other. We'd only get one cast of PoD though so probably not worth it. Unless it was huge and covered several compartments.