Why do you try to insert logic when considering the motives of the Mullahs? They would not have cared if anyone knew who it was, as a matter of fact, they would have made sure the whole world knew it. Second, that ship can carry many thousands of tons of cargo so tons of explosives necessary to blow a cloud into the air is only comprised of an area about the size of a large U-Haul truck (remember OK City?). Third, seeing a ship steam up to the territorial waters and stop would have only needed a few hours to let the crew get away (if that was ever the intent) and by the time someone was wise to an idle ship being there it would have already exploded. So what if the Israelis became wise to it? What were they going to do, sink it with a torpedo? (Same end result). We never expected terrorists to fly hijacks airliners into buildings until it happened.
“Why do you try to insert logic when considering the motives of the Mullahs?”
Because Iran is completely aware that a clear attack with WMD against Israel would invite retaliation, possibly nuclear retaliation. They are vicious and evil, but they aren’t stupid.