Weird Indestructible Tiles in Ocean

Hey, so I downloaded a really cool ship from the gallery, used bb.moveobjects before putting it on the beach lot that I want it on. Some things are still out of place anyway, don't know how to avoid that whenever I download lots from the gallery, but whatever. What bothers me most is that for some reason it imports with these weird indestructible tiles in the water? I can tell they're "connected" to the different floors on the ship, but they're not delete-able with the hammer tool. It's so weird, I've never seen anything like this before. I don't build a lot with beach/shore lots, so I'm guessing this is some sort of problem with the water.