CIA’s Office of Advanced Technologies and Programs developed the unmanned underwater vehicle (UUV) fish to study aquatic robot technology. Some of the specifications used to develop “Charlie” were:

speed | endurance | maneuverability | depth control | navigational accuracy | autonomy | communications status

The UUV fish contains a pressure hull, ballast system, and communications system in the body and a propulsion system in the tail. It is controlled by a wireless line-of-sight radio handset.