Even so, a ship towing a 45 foot sub would stand out like a sore thumb. My own preference would be to use an ordinary, inconspicuous sail boat, drop the "package" at night in water 30 or 40 feet deep, and give the GPS coordinates to people on land who'd make the pickup.
Can't carry enough, and takes too long. The scope of the business requires more volume. Additionally, people charged with tens of millions in goods who will pay with their lives if its lost, will not let it out of their sight. Remember also that money has to be moved as well.
use an ordinary, inconspicuous sail boat, drop the "package" at night in water 30 or 40 feet deep, and give the GPS coordinates to people on land who'd make the pickup.