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NOSI – Naval Open Source Intelligence™

Operational naval news, curated from open source intelligence, intended to serve as a source of continuing naval education. By Michael P. D'Alessandro M.D.

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Royal Navy nuclear submarine completes longest patrol on record

Posted on April 19, 2026 by Naval Open Source Intelligence (NOSI)

Navy Lookout – A Vanguard-class submarine returned to Faslane today after 205 days away, breaking the previous record for the longest unbroken patrol by a Royal Navy submarine.

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