Seems like this would be a great time for some stealth training for our invisible submarines.
Check it out:

National security experts have expressed alarm over the announcement by Iran that it will position its warships off the coast of the United States, from where they could launch a nuclear warhead to explode at high altitude to create an electromagnetic pulse.

That could knock the American electrical grid out of commission, disrupting supplies of energy, food, communications, fuel and more for a long period.

These experts agree that there would be no warning and that the U.S. missile defense system would not be able to respond in time to prevent the high altitude nuclear explosion. They also believe that if such a missile were launched, it would not be from an Iranian warship but from a commercial vessel sailing along the East Coast or in the Gulf of Mexico.

“It shows they could put a weapon on a boat or freighter, and if Iran has ballistic missiles it could put it anywhere on the U.S. coast,” said John Bolton, former U.S. ambassador to the United Nations and currently a senior fellow at the Washington-based American Enterprise Institute.

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