Food for thought, but the idea NORAD doesn’t know is pure BS.
Yep.
And if the British/French/Chinese/Russians (the only folks, besides us, who can launch an SLBM) did this, every hull in San Diego would be at sea chasing down the sub and every Navy/Marine aircraft in Southern California would be over the Pacific looking doing the same thing.
Plus we would probably be at Defcon 3.
Any of that happening?