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  1. U.S. revives Cold War submarine spy program to counter China

  2. The U.S. Spy System Listening for Chinese Subs: IUSS, Explained

  3. SOSUS - Wikipedia

  4. EARS Ocean Microphone System | Fisherman Catch Navy …

  5. US upgrades secret underwater listening systems to counter …

  6. The secretive world of underwater espionage – and how it traced …

  7. Secret US Navy underwater microphones detected Titan sub …

  8. NSA Spying | Electronic Frontier Foundation

  9. For decades, US has operated network of underwater listening

  10. Navy Thought It Heard Titan Sub Implosion Soon After It Went ... - Insider