Geezer wrote:
But in the pea and shell game the NK sub is the one to watch out for, analysts reckon most are old and cannot fire off missiles...but what if the old type IS the missile..lurking on the bottom of the Delaware or Hudson???
This is not an option.
NK ocean-going submarines are noisy '60s-era Soviet Romeo class diesels, sourced from China from 1973-95. They are half the size of the Collins with more than 50 crew. They are not suitable for a sub-polar transit and their range is insufficient to reach the east coast of the United States.
In theory they could reach the west coast. But in reality they would need to escape satellite surveillance of their departure and transit (they can't be submerged all the way), be mechanically reliable for a journey an order of magnitude greater than any previous NK submarine patrol and then elude sonar detection on the US continental shelf. It'd be worse if the USN was actively hunting them.