Robuta

https://www.canada.ca/en/department-national-defence/news/2016/09/royal-canadian-navy-concludes-successful-anti-submarine-warfare-drills-john.html
More than 3,000 personnel from five partner nations successfully concluded the inaugural edition of CUTLASS FURY, a joint maritime training event conducted off...
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https://en.wikipedia.org/wiki/Royal_Navy_Submarine_Service
royal navy submarineservicewikipedia
https://www.navy.mil/Press-Office/News-Stories/display-news/Article/3805551/first-royal-australian-navy-enlisted-sailors-begin-training-at-us-submarine-sch/
GROTON, Conn.--The U.S. Naval Submarine School in Groton welcomed its first cadre of nine enlisted sailors and the second cadre of three officers from the...
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https://www.warhistoryonline.com/news/coronation-park-royal-navy-submarine.html
A team of experts believe they've confirmed the existence of a Royal Navy submarine beneath the greenery of Dartmouth's Coronation Park.
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https://www.navalnews.com/naval-news/2025/10/royal-navys-newest-astute-class-submarine-dives-for-the-first-time/
The UK's Astute-class submarine, Agamemnon, newest nuclear submarine has successfully submerged for the first time at BAE Systems in Barrow, Cumbria.
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https://www.twz.com/39055/new-wake-detection-sensor-spotted-on-royal-navy-submarine-as-it-pulls-ito-gibraltar
These somewhat exotic non-acoustic sensors that were once mainly found on Soviet submarines would help supplement sonar when searching for other subs.
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