After being over-hunted for centuries, the recovery of the blue whale has been slow and mysterious. These giants are still elusive to scientists eager to track their recovery closely, hoping to watch the blues someday return to seas where they have been long-since extinguished. Around the Seychelles Islands, one expedition follows a rumor that blue whales may be returning to waters they once called home — but even finding a 100 ft creature is improbable in a vast expanse of ocean. Meanwhile, across the globe in one of the few remaining bastions of blue whales, researchers in the Gulf of California track their health season after season as they return to warm waters to mate. In these calmer seas, scientists take samples and careful observations of whale behavior to peel back decades of questions about blue whale biology. Teams of scientists a world apart are united in their love and astonishment of the blue whale — gentle giants of the ocean depths, and a story only truly appreciated on the majesty of Giant Screens.