Can you please elaborate? How do you reckon the USSR would achieve such a feat? (If your answer involves ‘submarines’, you’re under-estimating the ASW capabilities of a carrier group.)
As those kinds of subs are available to more and more countries you can't always "park" a carrier group without risk.
https://en.wikipedia.org/wiki/HMAS_Waller_(SSG_75)#Operation...
And the carrier group's use of active sonar is limited (whales). And the actions of the protecting sub(s) are classified. And we still havent mentioned the rise of anti-torpedo/missile technologies. ... the real outcomes never makes it into the public domain.