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  1. An analytical review of all information released by the Comprehensive Nuclear-Test-Ban Treaty Organization on the acoustic signal associated with the loss of the Argentina Submarine *ARA SAN JUAN* confirms the following:

    ● That acoustic signal originated near 46-10S, 59-42W at 1358Z (GMT) on 15 November 2017. *It was produced by the collapse (implosion) of the ARA SAN JUAN pressure-hull at a depth of 1275-feet*. Sea pressure at  the collapse depth was *570 PSI*. 

    ● The frequency of the collapse event signal (bubble-pulse) was about *4.4 Hz*.

    ● The energy released by the collapse was equal to the *explosion of 12,500 pounds of TNT* at the depth of *1275-feet*. 

    ● That energy was produced by the nearly instantaneous conversion of potential energy (sea-pressure) to kinetic energy, the motion of the intruding water-ram which entered the SAN JUAN pressure-hull at a speed of *about 1800 mph*.

    ● The *entire pressure-hull was completely destroyed* (fragmented/compacted) *in about 40 milliseconds* (0.040s or 1/25th of a second), the *duration of the compression phase of thecollapse event* which is half the minimum time required for cognitive recognition of an event.

    ● Although the *crew may have known collapse was imminent, they never knew it was occurring*.

    ● *They did not drown or experience pain. Death was instantaneous*.

    ● The *SAN JUAN* wreckage *sank vertically* at an *estimated speed between 10 and 13 knots*.Bottom impact would not have produced an acoustic event detectable at long range*.

     â– The open questionis: ... *Why was no corrective action - such as blowing ballast - taken by the *SS SAN JUAN* *crew before the submarine sank to collapse depth?* 

    According to Argentine Navyspokesman Gabriel Galeazzi, the Commanding Officer of the *SS SAN JUAN* reported a *"failure"* in thesubmarine's *"battery system"*, The time of that report was 0730 on 15 November, assumed to have been GMT. Subsequently, the problem was reported to have been *"fixed"*. 

    The *SS SAN JUAN* intended to submerged and continued its transit north. The*SS SAN JUAN* *pressure-hull collapsed at 1358 GMT on 15 November*.

    In the case of the loss of the US nuclear submarine *SCORPION (SSN 589)*, hydrogen out-gassed by the main battery exploded at 18:20:44 GMT on 22 May 1968 *incapacitating/killing the crew with an atmospheric over-pressure in the battery well, estimated to have been 7-10 times the fatal value*. The pressure-hull was not breached. This assessment was based on analysis of acoustic detections of the event and damage observed in pieces of the fragmented battery recovered from the wreckage at a depth of 11,100 feet by the *US submersible TRIESTE*, e.g., microscopic, spectrographic and x-ray diffraction analyses. (There was no flooding of the pressure-hull before the battery exploded.)

    *USS SCORPION (SSN)* lost power and sank slowly over nearly 22 minutes to collapse at a depth of 1530-feet at 18:42:34 GMT on 22 May 1968.

    There is the possibility that a similar sequence of events occurred aboard the *SS SAN JUAN*. If the wreck is located and efforts are made to recover components, emphasis should be placed on the battery system.

    Bruce Rule

    Lead acoustic analyst at the US Office of Naval Intelligence