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India,

FYI
The UW hand signals was developed by the late Bob Reutherford and the now defunct Sea Sabres dive club in 1954..You can read my article "Sea Sabres UW signaling system " (I recall that was the title?- I have published many articles and have had 5 dedicated columns over the years) check it out www.portaagequarry "legends of diving ."

About 40 or more years ago the late Bonnie June Davis did a masters at UCLA on underwater communication or underwater audiology -- (Too many years have passed..).

It would be well for you to review these pioneering efforts ..

(While you are in the legends you can read about the events and people who were instrumental in creating recreational diving -- long before certifications )

good luck,'

SDM
Thank you for the article! I have bookmarked the Website so I can return and enjoy more of it!
 
https://www.shearwater.com/products/perdix-ai/

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