90% of Americans believe at least one conspiracy theory

What’s the conspiracy about the Titanic?
Not sure of all of them, there are more than a few, or the specifics, but one of them was that it wasn't the Titanic that sank, but the Olympic. Another had something to do with a coal fire in the engine room. And I think there was one about it being sunk on purpose to kill some rich people that were onboard. I know there are more, but I'm not sure what they are.