C289 Sunlight Ten Thousand Meters below the Sea Floor

Although the island was deep under the sea, it had the same sky and clouds as the land. Because the giant tree, the Sun Tree Eve, which grows near Fishman Island, can transmit sunlight from the ground to Fishman Island, the island in the deep sea is subject to changes in sunlight and day and night. Residents even describe this phenomenon as "the grace of the sun"