The call of the ocean has always reached out to Hong Kong freediver Michael Sung Wai-yin, who is now one of the city’s best underwater divers, a sport he also views as a career. Raised in Wan Chai, Sung discovered the ocean at a young age when his mother, Grace Kowk, would take him to Deep Water Bay as a 10-month-old where she would swim while he floated alongside her. These early experiences, and playing water polo in high school, helped to spark his love of the aquatic realm. But it wasn’t...