London, England: General views of lake in Hyde Park at sunrise including person swimming, swan, and people silhoutted on jetty.

London, UK: General views of penguins walking, diving and swimming underwater in purpose-built ice enclosure.

Shoal of silver fish swim in unison across the screen. They twist and turn as they move creating flashes of light shimmering across the shoal

Point of view shot (POV) swimming through a reef, passing shoals of beautiful fish. A pacific manta ray approaches and passes by.

Prince William Sound, Alaska. Medium slow motion shot of killer whales swimming and surfacing in unison. Shoreline and forest in background.

Trio of Dolphins swim together around a reflection of the sun and move out of view

Wide shot of a group of penguins silhouetted against an orange sunset. Some orange light is reflected onto the water as penguins swim amongst waves.

Upside-down jellyfish swimming down to the seabed.

Opalescent squid all swimming past camera. Their bodies are tapered, long, thin and white.

Camera following a thornback ray swimming through thousands of white squid egg cases in clusters. As the ray swims, it glides over the egg cases that cover the sea bed. Opalescent squid swim in front of the camera, their white translucent bodies are long and thin with tentacles.

Various shots of an Oceanic Whitetip Shark swimming in a circular fashion near to the surface of the ocean.

Camera moves through sea water as fish swim by, then camera pans up to show a group of Scalloped hammerhead sharks swimming above with sunlight reflecting on them.

A scalloped hammerhead shark swimming past a shoal of yellow fish.

Underwater shot of a large shoal of Sardines swimming, camera moves through sea water and the fish move sideways to avoid it.

A rainbow runner fish and a barberfish swimming alongside each other. The rainbow runner fish is trying to catch smaller fish in its mouth.

Underwater shot of a coral reef in Papua New Guinea. Shoals of fish swim around the reef.

A purple-banded jellyfish swims into shot. Its bell, tentacles and long trailing arms can be seen clearly.

Rio De Janeiro, Brazil: Wide shot of people sunbathing on Copacabana beach, close up of people swimming in the water and a wave breaking.

Underwater shot of a group of small fish swimming over a coral reef.

Underwater. Group of sea lions swimming acrobatically through dense kelp.

Scalloped hammerhead shark swimming in blue water. Shark swims across frame.

A scalloped hammerhead shark swimming through a shoal of fish over a reef.

A moon-jellyfish swimming silhouetted against the water's surface.

Shoal of silver fish swim in unison across the screen. They twist and turn as they move creating flashes of light shimmering across the shoal.

A scalloped hammerhead shark swimming above a shoal of yellow fish.

Shoal or school of creole wrasse tropical fish swimming in all directions against blue sea water, they are silhouetted so appear dark in colour

Farallon Islands,California,USA: Underwater view looking up at male swimmer wearing flippers, swimming along surface of water in sea in strong sunlight

A group of scalloped hammerhead sharks swimming.

Shoal or school of creole wrasse tropical fish swimming in all directions against blue sea water, they are bright blue in colour

A rainbow runner fish and a barberfish swimming alongside each other.

A shoal of yellowtail surgeonfish swimming close to a reef.

A Pacific Manta Ray swimming down towards a coral reef.

Close-up shot of a large shoal of blue-striped snapper fish swimming together.

Underwater shot of a large shoal of sardines swimming over a coral reef.

Ukraine: Two shots of a river beach with people milling about, sunbathing and swimming at the water's edge.

A shoal of beautiful bright yellow fish swimming above a reef.

A rainbow runner fish trying to catch smaller fish in its mouth, while a barberfish swims closeby.

Cocos Island, Wide shot of a shoal of swimming under a reef arch. Fish glow in a vibrant pink as their scales reflect sunlight.

Shoal of silver fish swim in unison across the screen. They twist and turn as they move creating flashes of light shimmering across the shoal

Blue-striped snappers swimming over reef, their yellow colouring looks striking against the blue of the water. As the fish swim out of sight, we can see a couple of hammerhead sharks in the distance.

Underwater shot of many small and colourful fish swimming around a dark, spindly coral. The fish swim to take cover in the coral and return to swim playfully around it.

Shot following a shoal of yellowtail surgeonfish as they swim close to a reef.

Underwater shot of many small, colourful fish swimming over a pale coloured coral reef. The fish contrast against the vivid blue sea water.

Underwater shot of soldierfish swimming over a coral reef with blue-striped snappers swimming in the background.

Point of view shot (POV) swimming above shoals of beautiful bright yellow fish. In the distance a group of scalloped hammerhead sharks can be seen.

Shoal or school of bright blue creole wrasse tropical fish swimming against blue sea water. Another breed of fish, a bit bigger, swims through them, an indvidual in the crowd.

Close-up shot of a large shoal of blue-striped snapper fish swimming over a reef.

Medium close up of a mother seal supervising a pup swimming under an ice sheet. Blue hue to shot. The seals' coats shine when the occasional ray of light penetrates the water.

Underwater shot of a whitetip shark swimming towards the camera and turning away in front of it. Pilot fish swim playfully around the shark.

Underwater shot of a common seal lounging in a rock crevice. It curiously sniffs the camera and swims away.