Long read, but interesting for sure at least to those that don't have top secret clearances.
This information was available in real time ...
Sonar has two modes active and passive ... ASW ships use active and submarines use passive.
The active ping can't tell you what country your ship may have located, but passive sonar can.
From what I have heard whenever a Russia submarine located a USN submarine they would use a tactic
called 'chicken dance' and steer straight for it without any data (in the 60's) to tell what depth the other boat was at.
That's how they got the name 'chicken dance' ... the first one that moved was the chicken.
If the Russians couldn't figure out how to dispose of a nuclear submarine ...
How were they smart enough to know how to build one?
Thank God we never had a war to figure out which side was better