Part 4/10:
The sperm whale, a fascinating creature, has a lifespan that can exceed 70 years. Behrend learns about their unique communication methods, primarily through clicking sounds used for echolocation. As the team employs hydrophones to track the whales' calls, they navigate the often unpredictable sea, hoping for closer encounters. The challenges inherent in wildlife filmmaking become clear as one of their promising moments fades; the whales disappear into the depths, leaving Behrend and his team longing for capturing footage.