The Fateh , I've discussed it previously in this thread, the Bessat is much more powerful and will be able to navigate in blue waters and high seas alongside the Iranian kilos as a complementary asset, and on its own, since it is a very capable submarine that can operate in littoral and shallow waters too, The Fateh will operate alongside the Ghadir subs as a complement again, and or alongside the Bessat subs, its man role is in shallow waters, but can operate in the open seas too. They will both carry torpedoes (Hoot among them ) and missiles, they both have some AIP capabilities, since Fateh can stay under water for more than 30 days, they both use fuel-cells to navigate on electric power, so they have electric engines, they both have, a lot of sensors and twelve different kinds of sonars, they use the most advanced noise reduction tilings to reduce noise further, so they are very quite, I might say deadly quite. They use state of the art navigation tech with GPS and other communication means, integrated with other surface, subsurface, land and air assets, high tech optics and optronics to scan the sea surface with powerfull and sophisticated video cameras and gear for every aspect of calculations, almost everything is computerized, so they need less people to navigate and operate them. To sum it up, there will be no gaps left for anyone to exploit in case of war, sub-surface wise, for defense purposes. And a complete sub-surface war machine for offensive operations.