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