SURIN ISLANDS, Thailand — When Hook was a child, he started his days by jumping off the boat that his family lived on and into the ocean. By age 3, he could already swim and dive in shallow waters. His home was a kabang, a boat, that his family sailed in Thailand's southern waters. The ocean was his backyard.

Now Hook, whose full name is Suriyan Klathale, lives on land like the rest of his community, a people known as the Moken. The recollections of his childhood, which many Moken of his generation still have, are mostly just memories.