People have been exploring the Earth since ancient times—traversing deserts, climbing mountains, and trekking through forests. But there is one ecological realm that hasn’t yet been well explored: the oceans. To date, just 5 percent of Earth’s oceans have been seen by human eyes or by human-controlled robots.
Image: Yogesh Girdhar, a researcher at Woods Hole Oceanographic Institute, swims with a "curious" robot he helped build. // Ioannis Rekleitis / McGill University
