In fallout 3-Point lookout How do you get the key to the engine room on the boat if there is 1

after you meet the girl you were supposed to find (she is in the ark and dove cathedral ) she says she will meet you at the dock go there in two days (wait 48 hours) and she will be there she will say "I found the guy who cut open our heads) it was the boat captain walk to the engine room it will be unlocked and the captain of the ship will say some stuff and will try to kill you kill him and go outside the girl will say its her ship now and will give you free rides on it back and forth from the wasteland. oh the engine room is full of jars with chunks of brain in it