An underwater view of a massive swarm of krill swimming beneath floating ice shelves in cold, clear ocean waters.

An underwater view of a massive swarm of krill swimming beneath floating ice shelves in cold, clear ocean waters.

An underwater view of a massive swarm of krill swimming beneath floating ice shelves in cold, clear ocean waters. Ver mais

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A dense swarm of translucent orange Antarctic krill swims beneath the pack ice, with blue light filtering through the ice and green algae visible on the underside of the floe.

Sunlight streams through openings in the ceiling of an underwater lava tube, illuminating the white sandy floor and a small school of fish swimming between dark basalt rock walls.

A brinicle, an underwater ice stalactite, extends from the frozen sea surface down to the dark, rocky seabed where starfish and sea urchins are trapped in a spreading web of ice, illuminated by dim blue-green light filtering through the ice above.

An underwater view of a shallow reef with brain corals and a school of striped sergeant fish, looking up at a rain-pocked surface in soft grey-green light.

A shark swims through a dense bait ball of small silver fish beneath the ocean surface, with sun rays filtering down from above.

A translucent sea angel swims beneath ice floes in deep blue water, backlit by sunlight filtering through the ice.

A shoal of red-bellied piranha swims through tea-colored, tannin-rich water with sunlight filtering down in amber shafts, illuminating their silver scales and red bellies amidst submerged tree branches.

A wide-angle underwater view of a coral reef with tan and violet hard corals and a school of small fish swimming in clear blue water under bright sunlight.

A scuba diver in a black drysuit hovers underwater beneath a thick ice sheet, with a square opening in the ice allowing a bright shaft of sunlight to illuminate the dark, turquoise water.

A large swarm of translucent jellyfish floats beneath the surface of the ocean, illuminated by sunlight filtering through the water.

Sunlight filters through the water in a kelp forest, illuminating kelp bass swimming among rocky terrain and tall kelp stalks.

A large shoal of silver fish swims above a dense underwater forest of kelp, with sunlight filtering through the water in green shafts.

A school of bumphead parrotfish grazes over a coral reef at dawn, with sunlight filtering through the water and creating a cloud of sand behind the fish.

An aerial view of a pod of beluga whales, including adults and calves, swimming in shallow turquoise water with their shadows cast on the gravel seabed.

A stone staircase descends into a dark abyss on the ocean floor, surrounded by bioluminescent sea anemones and suspended particles in the water.

A large school of blue tang fish swims through a sandy channel between coral reef formations in clear, sunlit tropical water.

A lion's mane jellyfish with an amber bell and long trailing tentacles swims in dark green water beneath a layer of sea ice.

Sunlight streams through the surface of deep blue water, creating visible light rays that penetrate into the dark depths below.

A low-angle underwater view of hundreds of Velella velella, or by-the-wind sailors, floating at the surface of the ocean with sun rays filtering through the water.

An underwater view of the textured, turquoise underside of a large iceberg, featuring visible cracks and air bubbles in the ice.

A large school of barracuda forms a tight, circular spiral underwater, silhouetted against the bright midday sun shining from above through the deep blue ocean.

A large school of small, golden fish swims inside a dark coral cave, illuminated by a single bright beam of sunlight streaming through an opening in the reef ceiling.

A large school of fish forms a spiraling column underwater, illuminated by sunbeams filtering down from the surface above a coral reef.

A large school of sardines swims in a tight, swirling spiral formation underwater, with shafts of sunlight piercing through the surface.

A view from inside a glacial ice cave with translucent, electric blue walls featuring ripples and dark bands of sediment, illuminated by sunlight filtering through from the tunnel entrance.

A school of golden dourado fish swims over a pale sandy riverbed surrounded by lush green aquatic plants in the clear, sunlit waters of the Rio da Prata near Bonito.

A school of transparent glass eels swims through dark water, illuminated by a bright, golden torch beam.

A view looking up from deep inside a glacial crevasse with towering blue ice walls, hanging icicles, and a narrow opening at the top showing a bright sky and a glowing turquoise snow bridge.

A freediver silhouetted against the bright surface light while swimming through a large, swirling school of fish in deep blue ocean water.

A large school of orange anthias fish swims above vibrant purple soft corals on a granite boulder reef, illuminated by sun rays piercing through the water from the upper left.

A view looking down into a deep underwater chasm with rocky walls featuring stalactites, illuminated by sunlight filtering from the surface into the dark blue water.

A split-level view of a large, blue iceberg floating in dark, calm ocean water under an overcast sky.

A great white shark swims upward from the dark depths toward a Cape fur seal silhouetted against the bright, rippled water surface in False Bay.

A wide-angle view inside a deep glacial ice cave featuring translucent, wave-textured blue walls and a bright tunnel of natural light at the far end.

Sunlight streams through an opening in a cave ceiling into the clear turquoise water of a cenote, illuminating limestone rock formations and mineral deposits on the floor.

A wide-angle underwater view of a shipwreck resting on its side, illuminated by a strobe light on the left, with a shoal of fish swimming past the rusted railings and coral-covered deck.

A sequence of frog development, from eggs to a fully formed frog, rests on a sunken branch in a sunlit, clear underwater pond environment.

An underwater view of a sculpted, turquoise-glowing ice cavern with a sandy, silt-covered floor.

A large, dense shoal of silver fish swims through clear blue ocean water, illuminated by bright sunbeams filtering down from the surface onto a sandy seabed.

A large tarpon swims through a dense school of silversides inside a dark limestone grotto, illuminated by dramatic sun shafts piercing through openings in the ceiling.

A large school of golden rays swims through clear, sunlit turquoise and deep blue water.

A large school of small, silver fish swims through a bright shaft of sunlight penetrating the deep blue water, with the surrounding area fading into darkness.

An underwater view of a turquoise ocean current swirling white sand and numerous air bubbles, illuminated by bright sunlight filtering down from the surface.

A group of emperor penguins swims upward toward a hole in the sea ice, leaving trails of bubbles in the deep indigo water beneath a glowing blue-white ice ceiling.

A school of grey reef sharks swims along a vibrant coral reef wall in deep blue water, illuminated by sun rays filtering from the surface.

An aerial view looking straight down at dark brown bull-kelp beds surging over rocky coastal shelves, with white ocean swell washing through the blades and sunlight flaring from the upper right corner.

A freediver in a black wetsuit swims through the center of a large, circular school of sardines in deep blue ocean water, illuminated by sunlight filtering from the surface.

A dense thicket of staghorn coral sits in shallow, clear turquoise water, with a large school of small blue-green fish hovering above the branches and sunlight creating shimmering patterns on the sandy lagoon floor.

Underwater view of a Posidonia seagrass meadow with long green blades backlit by sunlight, featuring a sandy bottom with light patterns and a small school of fish swimming through the vegetation.

A large school of silver fish swims in a tight, circular vortex formation underwater, illuminated by shafts of sunlight from above with visible bubble trails.

A large school of silver fish swims in a tight, swirling formation through sunlit ocean water.

A northern gannet dives through green water with its wings folded back, trailing a stream of bubbles, as a shoal of mackerel swims below in the sunlit water.

A large school of silver hatchetfish swims toward the camera in the dark ocean, illuminated by a bright overhead light, with a large, dark, indistinct shape looming in the background.

A southern stingray swims over a shallow, rippled white sand seabed illuminated by bright sunlight creating caustic patterns.

Three blacktip reef sharks swim through shallow, clear turquoise water over a white sandy bottom, illuminated by bright morning sunlight creating ripple patterns on the seabed.

A macro view of a vertical column of trapped air bubbles and a thin line of sediment embedded within deep blue glacial ice, illuminated by light filtering through from above.

A large, dense shoal of small silver fish swims through dark ocean water, illuminated by bright sunlight filtering down from the surface.

A large school of small, silver fish swims through a shaft of sunlight penetrating the deep blue ocean water.

An underwater view of a clear river with a sandy bottom, green aquatic plants, and several golden fish swimming in the sunlit water.

A view from underwater looking up through a triangular hole in the ice, with light filtering down into the dark green water.

Sunlight creates caustic patterns on submerged green and grey pebbles in a river, with air bubbles clinging to the stones and a clear, emerald-toned open space to the right.

An underwater view looking up at a dense layer of floating pumice stones, with sunlight streaming through the gaps in rays and small silver fish swimming beneath the rocks.

A large school of fish swims in a circular formation underwater, creating a tunnel-like effect with sunlight filtering through the surface above.

A seal swims beneath the Antarctic ice, silhouetted against a circular hole of light in the frozen surface, with ice crystals drifting in the deep blue water.

A vibrant coral reef wall drops into the deep blue ocean, illuminated by bright sunlight filtering through the water surface.

A large, dense school of sardines forms a spherical bait ball in deep blue ocean water, illuminated by sunlight filtering down from the surface.

A school of orange redfish swims among white Lophelia coral colonies on a dark, deep-sea reef illuminated by the twin spotlights of a submersible.

A vibrant coral reef with purple staghorn coral and ochre brain coral sits on a sandy seabed under clear, sunlit water with rippling light caustics and a school of small fish in the background.

A small white submersible floats near a towering column of silver bubbles rising from an underwater vent, illuminated by a shaft of amber light in a deep teal ocean with pale fronds on the seafloor.

A large bloom of translucent moon jellyfish drifts through deep blue water, illuminated by a bright shaft of light from above.

A vertical underwater view shows a single bright sunbeam piercing through clear blue water, illuminating a rocky reef and a sandy sea floor with small fish swimming in the light.

A cluster of small air bubbles rises through clear turquoise water above a sandy seabed with coral reefs, illuminated by bright sunlight from the surface.