| 1. | Another non-performer was " Down Periscope ".
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| 2. | He would be low but his head was like a periscope.
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| 3. | There were more raised periscopes than the Sixth Fleet on maneuvers.
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| 4. | Imagine a Russian periscope popping up off the Fulton Fish Market.
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| 5. | The sub slipped down from periscope depth, about 60 feet.
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| 6. | Coen and Waddle then performed an 80-second periscope check.
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| 7. | Modern submarine periscopes incorporate lenses for magnification and function as telescopes.
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| 8. | The periscope chassis may also support a radio or radar antenna.
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| 9. | It is unclear whether the periscope was used during the flight.
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| 10. | At 13 : 10, the submarine returned to periscope depth.
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