Epipelagic Zone
Also called the "sunlight zone," this uppermost layer receives enough sunlight for photosynthesis. Most marine life—from plankton to large fish—lives here, and it's where the ocean appears bright blue.
Mesopelagic Zone
Known as the "twilight zone," light dwindles quickly and photosynthesis is impossible. You'll find bioluminescent creatures and vertical migrators that rise at night to feed near the surface.
Bathypelagic Zone
Often called the "midnight zone," it's in perpetual darkness. Temperatures hover just above freezing, and life here copes with immense pressure; many species are blind or have specialized sensory organs.
Abyssopelagic Zone
Covering the ocean floor's abyssal plains, this "abyss" is near-freezing with crushing pressure. Life is sparse but includes hearty echinoderms, crustaceans, and strange fish adapted to extreme conditions.
Hadalpelagic Zone
Found only in the deepest trenches, the "hadal zone" has the highest pressures on Earth. Very few organisms survive here—mostly amphipods, certain worms, and microbes that thrive in extreme environments.