Beyond the web, try to find Terry Maas' & David Sipperly's "Freedive!" book, I remember large sections only about the history of freediving, spearfishing, creators of gear, etc.
Terry & David relays a Frenchman to have created the first pair of fins, with a Californian to have followed shortly.
Chris Engelbrecht, Copenhagen
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Chris Engelbrecht, Scania
“Today a young man on acid realized that all matter is merely energy condensed to a slow vibration, that we are all one consciousness experiencing itself subjectively, there is no such thing as death, life is only a dream, and we are the imagination of ourselves. Here’s Tom with the weather.”
The Hon'ble Bill Hicks
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