Half a croissant, on a plate, with a sign in front of it saying '50c'
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Sub Chaser Drone Mounted Sonar Buoys

Several dozen drones launched from the destroyer or aircraft drop in water and listen for subs.
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A great improvement to the decades old sonar buoys, these can fly themselves into place in a massive grid of thousands of square miles and unlike conventional drop buoys, fly back to be reused.

If this isn't being done now, it will be in the future.

doctorremulac3, Feb 16 2020

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       Several dozen?, hand manufactured somewhere by people hunched over soldering irons.
wjt, Feb 17 2020
  

       Maybe Huawei can make them cheaply, in quantity...
8th of 7, Feb 17 2020
  
      
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