Considering the recent RapidRecon entry regarding China's submarine force ambitions, an interesting new countermeasure may come in the form of an interesting Pentagon research project. (Originally noticed from a new member to the RapidRecon blogroll, GroupIntel.)

Swimming in a ship's wake, a remote-controlled _______ could track an enemy vessel's movements without being noticed, and under its own power.

The navy also hopes to exploit _______ natural ability to sense delicate electrical gradients and follow chemical trails left by a vessel.

Who says writing on National Security (and its Threats) is dry and dull?