china has seven major water systems, more than 2,600 natural lakes, and 2.997 million square kilometers of ocean surfaces ccc。 living on land, everything around you is wrapped in water. the advancement of image expression has long broken the boundaries of human cognition of the sky, but there has never been a documentary that systematically explored china's underwater. underwater •"china you haven't seen" subverts the past and forms a new popular science for china's underwater world, announcing to the world: underwater china, there are rich oceans, fairy tale-like worlds like lugu lake, magical underwater ancient city, and historical marks such as baiheliang and great wall that have lasted for thousands of years. they are not just cold images, they contain forbearance, strength, protection, innocence and kindness. they are engraved with the spiritual power of generations of chinese people. SMG the integrated media center took three years to travel tens of thousands of miles, covering most of china, with more than 200 hours of diving shooting and recording 16,000 records. GB the 4 K materials, trying to unveil the mystery of china underwater for the chinese people.