Quote from pspr:
I think they said if there were any "new" sanctions. I'm sure every ship and sub in their navy is constantly targeted for destruction. One loud bang and they will all be underwater if they don't behave.
There is a new set of sanctions being considered. One of them is a blockade of petrol imports to Iran. I guess they're saying if we block their oil/gasoline they will block crude oil shipments.
As you say, I imagine there would be a quick response by the USN but I do think crude prices will skyrocket nonetheless.