They think that the whale is dead, but then they make an alarming discovery

During his trip that took him through the Sea of Cortez (Gulf of California), this man comes across a young humpback whale floating motionless. Sure that the animal is dead he approaches it with his boat, only to discover instead that the huge whale is trapped in a fisherman's net. Since their rescue efforts may come too late, the crew is working hard to free it as soon as possible: In the end the animal will find its own way to thank them.