English: 330-PS-9119: A new underwater weapon system that employs a wire-guided torpedo has been developed for the Navy’s Bureau of Ordnance by Vitro Laboratories. Designated the Mark 39, the torpedo looks like a conventional model, but is actually an underwater guided missile capable of tracking and destroying its target despite object’s maneuvers and evasive actions. The torpedo is connected to the launching vessel by a wire that is paid out, spider like, from the torpedo as it drives through the water. Operators onboard the launching vessel send electrical signals over the wire to guide the torpedo to a “kill,” August 28, 1958. (11/5/2014).