Ouch, that meant not much diving on the way back either then, so many holes in the ship, they must have fixed it back together with bits of scrap metal lol.
I read a cool story of one sub bombed in the carribean. They had a massive hole in the front and couldnt dive, they fixed a sheet over it to give it some waterproofing. Then got bits of the plane (they had shot it down, or he killed himself in the blast i forget which) and used that to fix the hull. Ingenious what they could do. With the jury rigged U-boat they could dive to 100 metres. So i suppose in game they got 50% hull damage
Cool and amazing what people can do when they put their minds to it!