Free 'n' challenging, but fast becoming popular

Even as scuba diving gains momentum in China, another type of diving - free diving - is vying for the spotlight.

According to a report from Hotels.com last year, regular sightseeing has gradually lost its appeal to the country's millennials. More and more members of the younger generation only travel to pursue different lifestyles or look for thrilling adventures.

Free diving, or diving into deep water without an air tank, is growing in popularity among the country's stouthearted young.