Jaina, you are fortunate though that your fear is one that you'll never have to face. Going into a shipwreck is a choice, and you can choose to never go scuba diving into a shipwreck.
Though I see where you're coming from. Going near shipwrecks would be cool, but going in would be a bit much.
My cat has been freaking me out lately. She occasionally stares at places in my house where mice have appeared in the past. It makes me think she's heard something and is waiting for it to pop out.
So when she behaves oddly like that now, I lock her in the bedroom with me overnight (with food, water, and litter) and set traps out by where she might hear mice. I caught one two weeks ago from that.
-Sparks Nevada, Marshal on Mars
"Who cares what evil lurks in the hearts of men!"
"Unless evil's carrying the Martini tray, darling."
-Frank and Sadie Doyle