hijacking, bombing, underwater mine ops, decoy, etc.
Hijack a carrier? You can use anything for a bombing target. Not sure what you mean by 'underwater mine ops' but if you mean that they're going to try and figure out how to attach a mine and sink it then they would have to duplicate the strength and structure of a Nimitz class carrier and you don't do that with a couple of barges welded together. Decoy for what, the other Iranian carriers?