The Fear of Dark Water

I have a phobia of man-made structures in water. The sheer size of it and the fact that it's made out of metal and steel, I don't know. Same thing if I were just swimming next to a giant boat,. cruise ship, one of those, it just scares the shit out of me. But see, if I was next to an airplane, I feel fine. It's for some reason only in the water with these giant metal big structures where I'm like, I hate this. And it could have something to do with the water too and just the depths of being closer to the propeller. Or maybe feeling like you could go under it or something like