Ocean Guardian’s Shark Shield Technology making waves in National Geographic’s Shark Beach with Chris Hemsworth Share Article Ocean Guardian, makers of the world’s only scientifically proven and independently tested electronic shark deterrents, have featured prominently in National Geographic’s ninth annual SharkFest shown on Monday, July 5 in the marquee special Shark Beach with Chris Hemsworth, available for streaming on Disney National Geographic on July 9th Tom Carroll 2x World Surf Champion SYDNEY (PRWEB) July 08, 2021 Ocean Guardian, makers of the world’s only scientifically proven and independently tested electronic shark deterrents, have featured prominently in National Geographic’s ninth annual SharkFest shown on Monday, July 5 in the marquee special Shark Beach with Chris Hemsworth, available for streaming on Disney National Geographic on July 9th.