I kinda lean toward that conclusion that nothing identifiable remains,
especially since the implosion allegedly was sonar located at 9,000 feet, giving 3500 feet above sea bottom for currents to carry off remainders.
On the other hand the Russian Submarine K-129 that imploded at great depth
had identifiable sailor remains when the Golmar Explorer crane lifted it up many months later:
https://www.maritime-executive.com/features/grand-finale-for-infamous-glomar-explorer-part-1_1https://en.wikipedia.org/wiki/Glomar_Explorer
