New underwater drones, designed to sniff out hard-to-detect submarines and threats to vulnerable undersea cables, are being tested in the Baltic Sea.

The GreyShark, developed by German technology companies EUROATLAS and EvoLogics, is a penguin-shaped autonomous underwater vehicle (AUV) able to spend up to four months at sea in one go.

The high-endurance version has been christened Foxtrot, and a shorter-range, battery-powered model of the GreyShark is known as Bravo.

The drone is described by its developers as silent, cost-effective, and able to switch between protecting critical undersea infrastructure to detecting stealthy submarines—or helping to clear mines—without receiving new instructions from a human operator.

Several European NATO nations around the Baltic Sea are interested

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