Iran has deployed at least a dozen Maham-3 and Maham-7 naval mines into the Strait of Hormuz -US officials to CBS Both types are capable mines equipped with magnetic and acoustic sensors fused to hundreds of pounds of explosives.

H/T @CAT_UXO for their amazing catalogue of explosive threats

@CAT_UXO Notably, both are likely configured to be fixed, which means Iran would be aware of the minefields’ locations. Would enable Iran’s current scheme to only let approved vessels through, and enable easy clearing if Iran chose to do so.