CNN  —  A boy survived the sinking of a tourist boat in Vietnam which killed dozens of people by sheltering in an air pocket of the overturned vessel, it has emerged. The 10-year-old had been traveling with his family in Vietnam’s famed Ha Long Bay when the vessel they were sailing on became caught in a sudden storm. Trapped in the boat as it capsized, the boy found refuge in an underwater air pocket, where he stayed and waited for help. He was eventually found by rescue teams relatively