Dhaka, Dec. 22 -- 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 community, indigenous people from Thailand and Myanmar, came to worldwide attention for its members' understanding of waves when the Indian Ocean tsunami struck in December 2004, killing more than 200,000 people. The few tourists who happened to be on the islands inhabited by the Moken survived because locals knew, ...