Really.
Every time it has been, typically the Mullahs navy gets its shit kicked in.
$10 billion a year. Maybe.
"Look at this Swedish submarine that has never been used in combat! Truly diesel engines with stealth systems are the way of the future!" nationalinterest.org/blog/the-buzz/…
Anyways, lets say Iran actually decides to deploy its submarine force to lay in wait after having threatened weeks ago to cut off the strait of hormuz.
Who's to say our subs, who can sit at the ocean floor for FAR longer, aren't already there?