ProtectedShips Cost advantage of unmanned vessels By ANI - October 25, 2020 0 1697 An artist’s rendering of the Anti-Submarine Warfare (ASW) Continuous Trail Unmanned Vessel (ACTUV) ‘Sea Hunter’ DARPA image. With the Pentagon pitching a future naval force design that calls for as many as 240 unmanned and optionally manned ships on the surface and under the sea, a natural question is: what will they all do, a US Naval Institute report asks. Please Login to view this content. (Not a member? Join Today!)