WARFARE EVOLUTION BLOG. In our last escapade, we investigated the worldwide market for warships and submarines. Out of respect for the literary principle of subject matter continuity, we are forced to explore the worldwide market for UNVs (unmanned naval vessels) in this essay, since they are an extension of warships and submarines. UNVs break down into two basic groups: unmanned surface vessels (USV) and unmanned underwater vehicles (UUV). We will deal with naval unmanned aerial vehicles (NUAV) in another composition.