I have what may be a scale issue in my imagination, so bear with me if this is silly.
There are reports of international drug transport via seaborne drones in the 0.5-5 tonne range, and of these crossing the Pacific, and the cost of the vehicles is estimated to be around 2-4 million USD each. If drug dealers can do that, surely Iran (and basically everyone with a GDP at least the size of something like Andorra's) should be able to make credible threats to disrupt approximately as much non-military shipping as they want to worldwide?
