It was not Barents sea but equipment and tactics would be the same:
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For most of the war, a lone Argentine diesel submarine, the San Luis, opposed the Royal Navy at sea. Not only did the San Luis return home unscratched by the more than two hundred antisubmarine munitions fired by British warships and helicopter, but it twice ambushed antisubmarine frigates.
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The Royal Navy, for its part, expended hundreds of expensive antisubmarine munitions and dispatched 2,253 helicopter sorties chasing false contacts—without detecting the San Luis on either occasion it closed within firing range.
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https://nationalinterest.org/blog/reboot/falklands-war-almost-had-tragic-end-british-192328