If the Iranians use these against the US Navy to try and close the Gulf of Hormuz by making it a radioactive fallout zone, (and the Iraniac is acting like he wants his bluff called),then there is a tactical plan in place which would be implimentented within the hour of such an event.
Like you I do not wish to see any nuclear explosions, but the US has 500 kiloton devices prepared and ready ( about 1/3 the size of those used in Hiroshima and Nagasaki) which will explode underground at the designated target sites in Iran , so as to minimize fallout. If the prevailing winds are from West to East, the down wind nations of Pakistan and India would certainly not be very happy campers, not to mention Southeast Asia.
Something there is not accurate. Hiroshima (Little Boy) was around 15 kilotons, and Nagasaki (Fat Man) was around 20 kilotons. A 500 kiloton device is pretty damn big.
Do you perhaps mean "5 kiloton", or was the "500" the number of devices rather than the yield of them?