The Navy has been testing a robotic spy fish designed to resemble a five-foot, 100lb bluefin tuna. If it is operational next year, it will be used to patrol harbors, enter enemy territory, and report back on the movements of enemy ships. The biometric fish is controlled by a video game-style joystick, but it can also be programmed to travel on a set course and is sturdy enough to carry cameras and other naval equipment. The Navy is hoping the motion of the fish will make it far less noticeable than most underwater vehicles. The Ghost Swimmer will potentially be able to evade sonar detection and enter enemy territory undetected to patrol and protect US ships and ports from harm.