Dolphin Island Author:Arthur C. Clarke Sixteen-year-old Johnny Clinton, an enterprising citizen of the Earth of the future, stows away one night on a giant cargo hovership that has made an emergency landing, somewhere in the middle of the US. Within only a few hours, the craft crashes into the Pacific Ocean and Johnny's life is saved y "People of the Sea" -- dolphins.
From the cover: Dolphin Island is science fiction master Arthur C. Clark's beloved classic of the young stowaway who is rescued by the "People of the Sea," and who in turn helps them defeat an enemy even more ancient and more ruthless than Man!