Ocean Depth Zones

A descent from the sunlit surface to the deepest trenches. The open ocean is divided into five pelagic layers by depth and light. Each band below is drawn as a colored slice whose shade darkens with depth — from bright epipelagic blue to the pitch-black hadal trenches over 10 km down.

Source: NOAA / National Ocean Service pelagic depth-zone classification (epipelagic, mesopelagic, bathypelagic, abyssopelagic, hadalpelagic) — a U.S. Government work in the public domain (17 U.S.C. § 105). Depth boundaries and light levels are standard, uncopyrightable oceanography facts. See https://oceanservice.noaa.gov/facts/ocean-zones.html