Based on the empiric relationship that exists between the volume of an air-filled structure
and the number of times in one second the pressure differential created by collapse
(implosion) of that structure cycles from compression to expansion back to compression – the
bubble pulse frequency can – with knowledge of the internal volume of the collapsing structure -
be used to determine the depth of the collapse event. The derived depth can then be used to
determine the energy required to produce the acoustically-detected bubble-pulse frequency
at that depth. The formula for this derivation is provided on page C4 of the following document:
USS SCORPION (SSN 589) RESULTS OF NOL ANALYSIS (U) NOL LTR SER 69-160 of 20 January
1970, Robert Price and Ermine Christian.

Personnel also need to know the “decay” rate of sequential bubble-pulse frequencies, a
characteristic that can identify collapse events. This subject is discussed in detail in Chapter
2 of “WHY THE USS SCOPRION (SSN 589) WAS LOST.” by the writer. (Royalties refused.)

Application of this knowledge may prevent USN spokespersons from providing the press
with such inane statements as the ARA SAN JUAN collapse (implosion) signal "was not a
whale or a recurring target."

Appropriate USN authority should control who says what about acoustic subjects.