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Russian Navy Vs. NATO Navy Submarine.

Russian Submarine Activity Near The UK Has Reportedly 'Increased Tenfold'

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NATO joins search for 'Russian submarine' off Scottish coast

German Nuclear Submarine Can Destroy Russia In 3 Seconds

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China Launches Nuclear-Powered Submarines, Rivaling US and Russia in Land and Sea Attacks

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Russian new submarine test fires its first intercontinental ballistic missile

தொழில்நுட்பத்தால் அழிந்த நீர்முழுகி கப்பல்! | Russian Kursk Submarine Disaster