Oh come on, you wouldn't even need the ASW gear to see the thing and sink it. Even a Merlin could polish the bugger off. But it won't need to, because the Septics will sink the entire Iranian navy if they try any of that sort of nonsense.
Lookingnorth. You are SofS Def and I claim my £10.
May I just ask what your ASW pedigree is? And what do you know of the capabilities of the Kilo-class submarine?
And may I suggest you Google Iranian mini subs? Or for that matter fast attack craft or suicide boats?