Trends making it harder to hide above the waves—more numerous and more capable sensors and more powerful ways of sifting through their output—are at play underwater, too
Once pictures showing its distinctive surfboard shape and solar panelling were put online, though, it was quickly identified as a “Wave Glider”—an uncrewed surface vessel built by Liquid Robotics, a California company owned by the aerospace giant Boeing. First developed to listen to humpback whales, the vessels’ ability to carry sensors slowly through the seas has seen them put to all sorts of uses by researchers and navies alike; over 500 have been sold to date.
The idea that submarines loitering in the depths are undetectable is fundamental to modern nuclear deterrence. America, Britain, China, France, India, Israel and Russia act on the basis that though a nuclear-armed adversary could conceivably destroy their land-based forces in a first strike, it could not wipe out their submarines. A submarine at depth cannot be seen from afar—daylight is all but undetectable at depths of more than a couple of hundred metres.
Arrays that can be towed behind ships are crucial to tracking what has been thus detected. If they could be made far more numerous, they might be able to do more detecting themselves. The sensors available for such arrays have improved greatly, according to Bryan Clark, a former submariner now at the Hudson Institute, a think-tank in Washington.
s could cover millions of square kilometres of ocean for “a fraction of the cost of a single frigate or submarine”, says Mr Perry, whose company has tested the concept in exercises with America’s navy. The bit of the Pentagon charged with pushing technological boundaries,, is working on an “Ocean of Things” project which would contain thousands of “low-cost floats…that drift as a distributed sensor network”.
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