Ballard was the diver I was talking about who investigated the Lusitania wreck. But it’s only a theory, not a fact. People like to postulate all sorts of reasons. For instance, did you know that several Germans were locked up in the brig at the time? They were arrested trying to plant explosives. If one of them had gotten loose, or if someone else was concealed aboard, he could have caused the second explosion. This sounds like a thriller novel!