In 1979, oceanographer Sylvia Earle descended 1,250 toes into the Pacific Ocean in a JIM swimsuit, setting the file for the deepest untethered stroll on the ocean ground. Now, standing beside a duplicate of the iconic swimsuit at the new National Geographic Museum of Exploration, she shares what she skilled throughout that historic dive — and why the sea continues to encourage surprise practically 5 a long time later, as a part of the Rolex Perpetual Planet Initiative.