Ocean Girl (1994)

S1E10 Major Breakthrough

With the installation of new monitoring gear, Dianne and Winston can eavesdrop on Neri's conversations with Charlie. However, when Charlie's tracking tag malfunctions, Dianne has to venture out to replace it. By using the melodies of Charlie and Neri, they successfully lure Charlie to their site. As Dianne dives, she runs out of oxygen, but Neri comes to her rescue, inadvertently exposing herself to Dianne and Winston. When Dianne's research risks being terminated, Neri steps in to fix the broken transmitter on Charlie, allowing her work to proceed.