When Marena Montoya and her new study partner, Samuel, embark on a shared mission, they get off to a shaky start. They need to research how whales and dolphins communicate, but they barely know how to talk to each other. Luckily, Marena’s OceanX mentor, Dr. Anna Knowles, is a marine mammal expert and an excellent coach. A baby otter and a dolphin need Marena and Samuel’s help, but when the team investigates an underwater noise issue, they become the ones in need of rescue. Trapped and in trouble, can Marena and Samuel escape on their own? Or will they need a little help from a sea mammal friend?