Words by Jill Heinerth  The underwater photo and cinematography community is mourning Val Ranetkins, founder of Aqua Vision Systems, Amphibico, Aquatica, and Valstech, all companies on the leading edge of underwater optics, housings, and lighting. National Geographic Explorer/Photographer David Doubilet remembers Val Ranetkins as “a Canadian national treasure.” Chuck …

Words by Dr. Joe MacInnis When a man’s life depends on your skill as a diving physician, your memory of him goes deep. So it is with Jon Lindbergh. We’re in Key West. I see him walking up the gangway to our ship Sea Diver. He’s 32 years old, carrying …