well if they knew anything about Persian gulf they station those subs as far away from Persian gulf as possible , the seabed is littered with magnetic junks and the sonar also wont work optimally there and their subs cant submerge in 3/4th of the Persian gulf. they even don't have the right camouflage for Persian gulf and will be detected easily by any passing bird even f they can submerge in some areas . in short they are not in areas they designed for . their subs can work perfectly in Arabian sea and Indian ocean. they coming near Persian gulf and thy are sitting dock
USA Navy knew about what I'm talking here when they send USS Georgia with those hilarious media coverage into Persian gulf , they silently removed it several day latter from the area and stationed it in Arabian Sea , obviously you are not aware of the situation of the Persian Gulf but USA navy is aware of it .