floes. and humpbacks in the pristine fjordlands of the far south. a crew, led by oceanographer susanna bucken, is searching for the largest animal that has ever lived. >> we are in the corcovado gulf in the northern part of chilean pat ghoe patagonia, and we're looking for blue whales. >> during the summer, this area is their primary feeding ground. around 700 chilean blue whales come here to feast. for the next ten days, this crew will live at sea, hoping to capture one of these ocean giants on camera.