Reply #8: Their subs

[Radius]

are old soviet diesel electrics. We have a signifigant presence there of LA class boats as well as the ASW componets of the carrier groups there. I would be very surprised if the navy in not actively tracking their naval assets and prepared to destroy them if necessary.
I work with a guy who shot the shit out of their brown navy gunboats. They picked them up on radar and put 5" cannon fire on them before they were in range to even counterfire.

Any entry by Iran into an open war would end very badly for them. They know they are better off just stoking insurgency rather than opening a hot war.