DARPA's TUNA Program Uses Buoys to Create a Data Network at Sea

If enemy combatants ever manage to knock out U.S. forces’ traditional tactical communications, DARPA, the Defense Department’s advanced research division, has a backup plan: Deploying a series of self-powering buoys connected by a network of fine undersea fiber optic cables that can keep people connected even in the choppiest waters. It’s called the Tactical Undersea Network Architectures or, cheekily, TUNA.

DARPA announced on Thursday the program’s recent completion, and...

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