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Undersea Telescopes Scan the Sky from Below - Scientific American
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Rare Look Inside A Nuclear Submarine, The USS Seawolf (SSN-21) | Super Structures | Spark - YouTube
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Periscope - Wikipedia
New US, British Navy Submarines Have New Kind of Periscope
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The Navy Just Launched Its Most Deadly Attack Submarine Ever - Warrior Maven: Center for Military Modernization
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Today's Document — Sarah P. Mather's Submarine Telescope, 07/05/1864 ...
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