Niue, also known as the Rock of Polynesia, is one of the tiniest island states in the world. It takes a mere two hours to drive around it, giving views of its rugged limestone cliffs and occasional sandy coves. These coves give way to caves and chasms, once used for storage, burial sites and even as living spaces. But perhaps what visitors seek most are its crystal clear waters, home to spinner dolphins, eels, grey reef sharks, sea snakes and humpback whales. Now the island is engaged in an innovative plan to try to conserve these vast and pristine territorial