Well, yes and no - you need a decent chink of infrastructure to build a submarine - you know, not having your engineering staff murdered, important supplies stolen, that sort of thing. It's hard to supply the sort of protection needed to guarantees these basic conditions when you're a long way from your support base. Of course, if a Somali warlord wanted to get in on the submarine-building business, he'd probably be able to make a decent amount of money. But I bet you could get the same service from a shady shipyard in Shanghai or somewhere similar for a lower price...