Subs-in-training Olly and Beth ignore Diver Dave's warnings and spend the night in a haunted shipwreck in this animated series that introduces tykes to a spectacular underwater world. In the process, they learn about the environment and each other. In another episode included here, Ranger the Cowboy Seahorse comes to Suzy the Sea Plane's rescue when she becomes hopelessly entangled in a kelp forest.