it is a very difficult and complicated technology, Pakistan has achieved a technological milestone with this Submarine launched cruise missile.. you should congratulate Pakistan on this..because usually one has to buy them off the shelf either from the US or France or others, and no one will give you ToT for this, so it is quite an achievement for Pakistan to be self sufficient in this very vital field..you can think of it as a 3rd, but minimum deterrent for now, still it is an important step for full 3rd capability deterrence..