The Navy is building an autonomous underwater drone to hunt down enemy submarines | International News Live Blog

https://internationalnewsliveblog.wordpress.com/2017/01/10/the-navy-is-building-an-autonomous-underwater-drone-to-hunt-down-enemy-submarines/

Forget about drones that fly — the Navy is building autonomous sub-hunting drones. http://internationalnewslive.com/the-navy-is-building-an-autonomous-underwater-drone-to-hunt-down-enemy-submarines/