Some of these deep-sea species use bioluminescence to glow in the dark, helping them attract prey or escape predators in the pitch-black waters.
Jellyfish with transparent, pulsating bodies and eerie, glowing tentacles have been spotted, resembling creatures from another world.
Some fish have needle-sharp fangs, allowing them to catch and swallow prey whole. Their scary appearance helps them survive in the deep ocean.
Certain fish have fins that work like legs, letting them "walk" along the ocean floor instead of swimming. Their unusual movement puzzles scientists.
These long, tube-shaped creatures live near hydrothermal vents, feeding on bacteria instead of hunting for food like most marine animals.
Some squid and octopuses are nearly invisible, using their see-through bodies to avoid predators and stay hidden in the deep sea.
Scientists have spotted creatures never seen before, raising questions about what other strange life forms might still be undiscovered in the ocean depths.