FTA: It can launch Posideon torpedoes that can destroy cities from afar. It can locate and manipulate objects on the ocean floor, including communications cable

FTA: It can launch Posideon torpedoes that can destroy cities from afar. It can locate and manipulate objects on the ocean floor, including communications cables that it can either potentially tap or cut, blinding adversaries. In my limited understanding, that are two wildly different roles; I don’t see why you would use a huge vessel like this (about 100 sailors, reading https://en.wikipedia.org/wiki/Oscar-class_submarine https://en.wikipedia.org/wiki/Oscar-class_submarine) to do wire-tapping. What do I miss?