Yes. Sorry, I meant they have about 100 subs. Most are "mini-subs".
Here are the details on the N. Korean Navy.
Their coastal infiltration boats are just that; vehicles to help insert special operations troops past the DMZ. The handful of them that are actually equipped with torpedo tubes are for taking out other coastal defenses.
To send them up against our fast attack boats would be like bringing your ten speed bicycle to a Motocross race. They are cramped, leaky Soviet knockoffs that are marginally seaworthy, and sitting ducks for any of our ASW platforms.