Some moments change the course of exploration forever. In 1979, oceanographer Sylvia Earle descended 1,250 feet into the Pacific Ocean in a JIM suit, setting the record for the deepest untethered walk on the ocean floor. Now, standing beside a replica of the iconic suit at the new National Geographic Museum of Exploration, she shares what she experienced during that historic dive — and why the sea continues to inspire wonder nearly five decades later, as part of the Rolex Perpetual Planet Initiative. #CallToEarth