ATHENS, GREECE—The world’s largest solar-powered boat, the PlanetSolar, will take part in a joint Swiss-Greek underwater survey of Kiladha Bay to look for signs of one of Europe’s first farming communities. Kiladha Bay was chosen as a target because it is located near the Neolithic site at Franchthi Cave. “There are all these amazing finds from Franchthi—pottery, ornaments—but nothing resembling a village. So there has to be another place where they were producing these finds,” Julien Beck of the University of Geneva told the Associated Press. He thinks that early farmers may have traveled to Greece from the East by sea. “We have neglected the importance of prehistoric seafaring,” he said.