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The Los Angeles-class attack submarine USS Helena (SSN 725) arrives at Norfolk Naval Shipyard for a high-priority docking continuous maintenance availability.
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NORFOLK, Va. (Aug. 20, 2015) The Los Angeles-class attack submarine USS Helena (SSN 725) arrives at Norfolk Naval Shipyard for a high-priority docking continuous maintenance availability. Helena will spend less than four months in the shipyard while workers complete the oil tank inspection and install technology upgrades. (U.S. Navy photo by Shayne Hensley/Released)

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