Only planes, boats and people. That's the whole point, if nothing disappeared nobody would have ever heard of it.
I'm going to take this as trolling
Its just a regular name like everything has a name. It describes the shape and approximate location.
I do not think so.
Sorry, but it is not. Hundreds of thousand of aircraft and ships pass through this area every year with no problems. But that does not create a story that gets retold.