I understand the skepticism behind this entire system however it does work, and has been used both east and west.
Currently the Astute have a non acoustic detection system installed along side the Sonar system, and two of the remaining Trafalgar's also have a similar system installed (its more prominent on Trenchant at the bow).
SOKS was trialed on a project 627A submarine and it was confirmed by the USN that she did track the American SSBN that had left Rota Spain, the only way they could get rid of the Soviet submarine was to bring out an attack boat and conduct some very aggressive maneuvers to shake her off.
When I went over to see Igor Kurdin he actually explained to me how the system works, I already had some knowledge of how the UK system worked and his details just confirmed that the UK and oddly Russia were pretty much on the same page, I also found out during this time the Russians knew the UK were trialing a similar thing as far back as 1981 and I had this confirmed by a former submariner who served on HMS Otus Ocelot Valiant and Splendid, this system has been on UK submarines since the 1980's with HMS Scepter being the first to trial it.
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