Thw wikipedia article mentions that the US Navy partially declassified thoe orginal recordings after the Cold War, and made the array availble to researchers.

Thw wikipedia article mentions that the US Navy partially declassified thoe orginal recordings after the Cold War, and made the array availble to researchers. If there was a military tech involved (with the source), I highly doubt they would have declassified that or as a conspiracy theory, it is misdirection...