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.)
Such wins are generally based on defined senerios. Specificaly, the carrier group is sticking to a known heading, allowing the sub to park itself ahead and wait.
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.
I would expect a carrier group would be a prime target for medium/long range nuclear missiles. They can't be hidden from military satellites so they would be like sitting ducks. Send 2-3 per group, at Mach 5-6 nothing can stop them and group is no more.
As those kinds of subs are available to more and more countries you can't always "park" a carrier group without risk.