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In 1963 the U.S. navy conducted some exercies near Puerto Rico when a sonar operator pick up a unidentified subaqueous object that was going over 150 knots and went down 27,000 feet.
Is this story true?
In 1963 the US Navy's sonar systems did not have the capability to measure 150 knots of doppler nor did the sonar systems have the capabilities to determine a target depth that extreme.
Destroyers did have a rudimentary depth determining system that worked in conjunction with the SQS-4 active system called the SQR-8 but its depression capabilities were extremely limited due too the crude beam forming capabilities of that era. Add to that the fact that it looked good in theory but did not really perform well in the real world.
Been there done that, did not happen.
Although not an expert on any of the systems that are mentioned by bob, I do think that yes, while they may have detected it, it is more likely to be an erroneousness reading than anything else
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