1st i've heard of this as well (though i'm not in the loop on these kinds of things) that said, you might enjoy the topic of 'narco subs' which are illicit sub

1st i've heard of this as well (though i'm not in the loop on these kinds of things) that said, you might enjoy the topic of 'narco subs' which are illicit submarines manufactured to smuggle drugs (mostly from latin america to the US as I understand it)