As Olly and his friends dive deep into the ocean blue, they learn valuable lessons about the environment and each other. For example, when Olly meets a friendly  sea monster, he has to make a tough decision. Should he keep the giant octopus' existence a secret, or should he report his discovery? In another episode, Olly and his best friend Beth are responsible for getting a young whale lost from his pod. The two friends must help the whale find his way home, and along the way they learn to be more considerate of others.