A deep-water nudibranch (Phyllodesmium iriomotense) a remarkable sea slug that thrives in the ocean’s depths. This fascinating creature grows to approximately 50mm in length and is typically found at depths around 30 meters. This shot was taken at a depth of 27 meters in Tulamben Bay, on the northeast coast of Bali—despite the species name referring to its type locality, Iriomote Island. In the image, it is feeding on octocorals—also known as Alcyonaria—colonial marine organisms with eight tentacles and eight mesenteries. These organisms thrive in deep-water environments and are likely part of the nudibranch’s diet.