The Ocean Depth is divided into five layers: the upper ocean (0 meters to 200 meters), the mesopelagic layer (200 meters to 1 kilometer), the deep ocean layer (1 kilometer to 4 kilometers), the abyssal layer (4 kilometers to 6 kilometers), and the ultra-deep ocean layer (below 6 kilometers).

Based on the intensity of sunlight penetration, the water layer from the ocean surface to a depth of 200 meters is called the upper ocean layer. Here, sunlight penetrates the seawater, making it relatively bright and giving it an ocean blue. This is how our Ocean Blue series come from.