I wish i could remember of hand which wreck it was but Dauvitt seems to attract books on the things so after a bit they get confused. The book had a picture which answered catspaw's point. most of the ships had safety doors but when carting things from a to be in the heat of battlethe men often wedged them open to save them having to do the constant opening and closing. Unfortunately in the case of fire or flood it gave it a clear run through the ship. If i can find the book I will post the details