Jess, in her search for Billy, flies on the back of a large seabird to an island, where she allows the sea to swallow her. Across the seabed she travels, searching the strange underwater world until she hears Billy's voice. Reunited, Billy and Jess once again share blissful times above and below the water. However, Billy explains to Jess that she does not belong there and insists she must return to the surface.