Pentagon scientists are planning to turn sharks into stealth spies" capable of tracking vessels undetected, a British magazine has reported. They want to remotely control the sharks by implanting electrodes in their brains, The New Scientist says. It says the aim is "to exploit sharks' natural ability to glide through the water, sense delicate electrical gradients and follow chemical trails". The research is being funded by the Pentagon's Defence Advanced Research Projects Agency (DARPA). It aims to build on latest developments in brain implant technology which has already seen scientists controlling the movements of fish, rats and monkeys. Such devices are already being used by scientists at Boston University to "steer" a spiny dogfish in a fish tank. The next step for the Pentagon scientists will be the release of blue sharks with similar devices into the ocean off the coast of Florida. Remote-controlled sharks...have advantages that robotic underwater surveillance vehicles just cannot match: they are silent, and they power themselves.