Imagine now building a submarine that would launch cavitating torpedo/missiles that would cruise under the water at high speeds until just offshore, at which point they come up out of the water and act like a cruise missile, flying at less than 500 feet and impacting a city before anyone even knew they were coming.
Actually, it was caused by their equivalent of a Mark 48 heavyweight torpedo.
Imagine now building a submarine that would launch cavitating torpedo/missiles that would cruise under the water at high speeds until just offshore, at which point they come up out of the water and act like a cruise missile, flying at less than 500 feet and impacting a city before anyone even knew they were coming.
The weapon would be bigger than most submarines, or the underwater phase would be extremely short.
Has this guy been reading your books?
Except these supercavitators are monsters and true underwater cruise missiles...6-8 ft diameter and 40 ft long. Launched off larger surface vessels...including container ships.