in the last caption she is literally screaming "U-boat". Now since it's not a short exclamation i considered putting "UUUUUUUUU-Boooooooaaaat" but the way i first read made it sound like awkward groaning before the word "Boat" so i decided to make it a pun while keeping things a little more legible. Feel free to change anything you don't fancy.
NYYYYYAAARRRGRAAAAAFF !! State your position !Wait for-Taking heavy fire through the main hallway!Ahoy ~ Bismarck why are you running away?I WONDER WHYWatch where you're . . . It's dangerous to run in the hallways!Y-yoUUUUUU Boooooaaat