There is no doubt that means spy still evolving day by day, and perhaps the most important way to success in this area is the inspiration of nature, and is exactly what the American Navy engineers in their design for a new underwater espionage.
The u.s. Navy already started during these days a set of tests on a new espionage is a robot diver in the form of a fish named "Swimmer" Ghost or ghost the swimmer and in partnership with Boston engineering Advanced Systems Group "leader in the field of robotics.
New Android which is draft Silent Nemo will be 1.5 meters and weighs 45 kilos and can dive to a depth of 91 metres maximum, and swimming and diving are completely silent as normal, and any fish will spy and collect information, remote controlled and battery allows him to stay too long under water.