Andres M. Dominguez / Dove's-foot crane's-bill leaf (Geranium molle) and algae in ice with air bubbles, Sierra de Grazalema Natural Park, southern Spain, February.

Franco Banfi / Scuba diver under ice, surfacing to the hole, viewed from underneath, Arctic circle Dive Center, White Sea, Karelia, northern Russia March 2010. No release available.

Franco Banfi / Beluga whale (Delphinapterus leucas) swimming under ice and exhaling air, with scuba diver in background, Arctic circle Dive Center, White Sea, Karelia, northern Russia, captive

Erlend Haarberg / Air bubbles frozen in ice, Helgeland, Nordland, Norway, November

Alex Mustard / Diver blowing bubble rings, while resting on the sand, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea, January 2011.

Sven Zacek / Frozen bubbles captured in ice on the surface of lake. South Estonia, Europe, January 2008.

Pete Oxford / Galapagos penguin (Spheniscus mendiculus) diving underwater, Bartolome Island, Galapagos, endemic

Pete Oxford / Galapagos penguin (Spheniscus mendiculus) diving underwater, Bartolome Island, Galapagos, endemic.

Alex Mustard / Silhouette of a New Zealand fur seal (Arctocephalus forsteri) diving underwater, Tasmania, Australia.

Alan Williams / Male Ruddy Duck (Oxyura jamaicensis) displaying on lake expelling air from breast feathers to form bubbles (captive bird) UK, May 2010

Guy Edwardes / Beads of water trapped on vibrant green moss Landmannalaugar, Southern Iceland, July 2009.

Bryan and Cherry Alexander / Grounded iceberg, with grooves caused by air bubbles eroding ice. Greenland, 1985.

Gerrit Vyn / Ruddy Duck (Oxyura jamaicensis) male in breeding plumage performing a "bubbling display"which is used in both courtship and aggressive territorial encounters. The male holds its head and tail and 2 ro...

Doug Perrine / Bryde's whale (Balaenoptera brydei / edeni) expelling air and water from mouth through baleen plates after engulfing part of a baitball of Sardines, Sardinops sagax, off Baja California, Mexico (Easte...

Jeff Rotman / Free diver coming up from dive to explore coral reef, Sinai, Egypt, Red Sea Model released Model released.

Edwin Giesbers / Air bubbles trapped in ice, the Netherlands

Kim Taylor / Water beetles (Dytiscus marginalis) and (Acilius sulcatus) clustered around an air bubble trapped beneath the ice of a frozen pond, digitally enhanced, Surrey, England

Ross Hoddinott / Ice pattern and trapped air bubbles, Dartmoor, Devon. UK

SIMON KING / Blue Ice on frozen lake with air bubbles, Antarctica.

Todd Pusser / Hector's dolphins below surface {Cephalorhynchus hectori} Kaikoura, New Zealand Pacific

Doug Perrine / Atlantic spotted dolphin bubbles coming from blowhole whilst it whistles {Stenella (Non-ex).

Pete Cairns / Air bubbles trapped in ice, UK

Martha Holmes / Bowhead whale releasing breathing out underwater {Balaena mysticetus} Arctic

Juergen Freund / Whale shark, diver and air bubbles {Rhincodon typus} Christmas Island, Australia

Michel Roggo / Brown bear (Ursus arctos) breathing out underwater, fishing for Sockeye salmon, Ozernaya River, Kuril Lake, South Kamchatka Sanctuary, Russia, August

Andres M. Dominguez / Air bubbles in ice, Sierra de Grazalema Natural Park, southern Spain, December.

Andres M. Dominguez / Dove's-foot crane's-bill leaf (Geranium molle) and algae in ice with air bubbles, Sierra de Grazalema Natural Park, southern Spain, February.

Andres M. Dominguez / Close up of detail of frozen leaf and air bubbles in ice, Sierra de Grazalema Natural Park, southern Spain, December.

Erlend Haarberg / Ice bubbles in the Selbusjoen lake. Klaebu, Norway, January.

Olga Kamenskaya / Diver with flowers for underwater celebration. Reflection can be seen under the ice in air bubbles made by the diver. Lake Baikal, Russia, March 2013.

Olga Kamenskaya / Diver examining broken ice formations underwater, blue sky visible through 1m thick transparent ice above. Reflection can be seen in air bubbles made by diver. Lake Baikal, Russia, March 2013.

Olga Kamenskaya / Reflection in air bubbles made by divers under surface of the ice. Lake Baikal, Russia, March 2012.

Charlie Summers / Air bubbles bloat the expanding top of the Strokkur Geyser just before it erupts. This geyser erupts every 4 to 8 minutes. Iceland, May 2014.

Michael Pitts / Tracking shot over a sunken shipwreck, with bubbles emerging, Maldives, Indian Ocean.

Fabrice Cahez / Forest reflected in bubble from small puddle, Vosges, France, May.

Jan Hamrsky / Lesser silver water beetle (Hydrochara caraboides) with bubble of air on its underside, Europe, June, controlled conditions

Olga Kamenskaya / Lines of bubbles caught in ice of Lake Baikal, Siberia, Russia, March.

Nick Upton / Mat of Green freshwater algae blooming on a damp draincover, releasing oxygen bubbles through photosynthesis, Wiltshire, UK, May.

Chris & Monique Fallows / Cape Gannets (Morus capensis) diving underwater to feed on sardines, Port St Johns, Transkei, South Africa.

Alex Mustard / Mosquito larva (Culicidae) in a shallow pool filled with vegetation. Giara GiarDi Gesturi National Park, Sardinia, Italy.

Jan Hamrsky / Water spider (Argyroneta aquatica) detail of air bubble around its abdomen, Europe, July, controlled conditions

Jan Hamrsky / Water spider (Argyroneta aquatica) refilling its air supply, Europe, July, controlled conditions

Jan Hamrsky / Water spider (Argyroneta aquatica) with air bubble, Europe, July, controlled conditions

Theo Bosboom / Close up of leaves (probably of purple moor grass) and bubbles captured in the ice, Deeler Woud Nature Reserve, the Netherlands, January

Orsolya Haarberg / Ice formations with air bubbles frozen under ice. Helgeland, Norway. January 2010

Franco Banfi / Air bubble under the ice, Arctic circle Dive Center, White Sea, Karelia, northern Russia

Franco Banfi / Beluga whale (Delphinapterus leucas) swimming under ice and exhaling air, Arctic circle Dive Center, White Sea, Karelia, northern Russia. Captive

Doc White / Blue Whale (Balaenoptera musculus) feeding at sea surface, releasing bubbles after a lunge. California, USA.

Jabruson / African Forest elephant (Loxodonta africana cyclotis) adult blowing air into mineral-rich sediment hole in stream flowing through forest clearing, Dzanga-Ndoki National Park, Central African Republic

Alex Mustard / 2020VISION / Puffin (Fratercula arctica) swimming underwater, Farne Islands, Northumberland, UK, July

Kathryn Jeffs / Blue iceberg, pure glacial ice, air bubbles have been compressed out with time, off the Antarctic Peninsula, Antarctica, Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Blue iceberg, pure glacial ice, air bubbles have been compressed out with time, off the Antarctic Peninsula, Antarctica, Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Blue ice, pure glacial ice, air bubbles have been compressed out with time, Antarctica, Taken on location for BBC Frozen Planet series, January

Nature Production / Greater Pied / Crested kingfisher (Megaceryle lugubris) diving for Dark Chub fish underwater, Shiga, Japan

Jeff Rotman / Diver discovers Roman Amphora on sea floor. Ustica Island, Italy, Mediterranean Sea Model released.

Roberto Rinaldi / Diver interacting with Dusky grouper (Epinephelus marginatus) off the coast of Capraia. Tuscany, Italy, August.

Guy Edwardes / Bubbling mud pools near Grindavik, Iceland, July 2009

Guy Edwardes / Beads of water trapped on vibrant green moss Landmannalaugar, Southern Iceland, July 2009.

Stephen Dalton / Common frog (Rana temporaria) tadpoles hatching from frogspawn, UK

Edwin Giesbers / Air bubbles trapped in ice, the Netherlands

Edwin Giesbers / Air bubbles trapped below the surface of an ice covered body of water, with grass below, the Netherlands

Stephen Dalton / Common frog (Rana temporaria) tadpoles recently hatched from spawn, UK

Laurie Campbell / Detail of air bubbles in ice, Berwickshire, Scotland, December

Stephen Dalton / European water spider {Argyroneta aquatica} underwater in air bubble bell, UK, Argyronetidae

Stephen Dalton / European water spider {Argyroneta aquatica} underwater in air bubble bell, UK, Argyronetidae

Stephen Dalton / European water spider {Argyroneta aquatica} underwater with its diving bell bubble of air, UK, Argyrometidae

Shattil & Rozinski / Bubbles of air caught in pond ice, Colorado, USA

Jane Burton / Bubbles of air streaming over the water surface of a fish tank for a fast flowing sandy river from Papua New Guinea.

Jane Burton / Various species of tropical fish in fish tank with plants and airlift, captive.

Tim Laman / Californian sea lion {Zalophus californianus} exhaling air bubbles, amongst Giant kelp forest, off Santa Barbara, California, USA, July

Kim Taylor / Phantom Midge (Chaoborus crystallinus) larva hangs motionless in the water with the aid of air bubbles fore and aft, maintaining its body in the horizontal position. Surrey, UK

Ross Hoddinott / Ice patterns and air bubbles, Dartmoor, Devon. UK

Doug Perrine / False killer whale ( Pseudorca crassidens ) with mouth open, showing large conical teeth, and exhaling a bubble blast from blowhole, captive, aquarium, from Indo-pacific, digitally manipulated

Pete Oxford / Galapagos sealion (Zalophus wollebaeki) underwater breathing out air bubbles, Gardner Bay, Española (Hood) Island, Galapagos Islands, South America

Pete Oxford / Galapagos sealion (Zalophus wollebaeki) underwater breathing out air bubbles, Gardner Bay, Española (Hood) Island, Galapagos Islands, South America

Pete Oxford / Galapagos sealion (Zalophus wollebaeki) underwater breathing air bubbles, Gardner Bay, Española (Hood) Island, Galapagos Islands, South America

Barry Bland / Bottlenosed dolphin {Tursiops truncatus}breathing out just below surface Bay of Biscay, Atlantic Ocean.

Pete Oxford / Galapagos sealion (Zalophus wollebaeki) underwater breathing out air bubbles, Gardner Bay, Española (Hood) Island, Galapagos Islands, South America

Willem Kolvoort / Freshwater algae of the Periphyton producing oxygen bubbles that ascend to the pond surface. Lake Naarden, Holland

Willem Kolvoort / Underwater view of Algae with oxygen bubbles they produce, Lake Naarden, Holland

Willem Kolvoort / Water beetle (Acilius sulcatus) on Canadian waterweed (Elodea canadensis), beetle has an air bubble under his back-shield, sand winning pit, Holland

Willem Kolvoort / European water spider (Argyroneta aquatica) underwater in air bubble in garden pond, Holland

Willem Kolvoort / Abstract view of air bubbles underneath ice, Holland

Duncan Mcewan / Grass and air bubbles trapped in ice, Scotland, UK

Jason Smalley / Close-up of air bubbles at the bottom of rockpool, Morecambe Bay, Lancashire, UK.

Jane Burton / Common Frog (Rana temporaria) tadpoles changing from gilled to air-breathing stage, blowing bubbles at surface

Kim Taylor / A soap bubble floating in the air - colour refraction on surface

SIMON KING / Blue Ice on frozen lake with air bubbles, Antarctica.

SIMON KING / Blue Ice on frozen lake with air bubbles, Antarctica.

SIMON KING / Blue Ice on frozen lake with air bubbles, Antarctica.

Jeff Vanuga / Air bubbles trapped in lake ice. Wyoming, USA.

Jeff Vanuga / Air bubbles trapped in lake ice. Wyoming, USA.

Yva Momatiuk & John Eastcott / Distant view of iceberg showing grooves created by rising air bubbles, summer, Saglek Fjord, Labrador, Newfoundland, Canada

Yva Momatiuk & John Eastcott / Distant view of iceberg showing grooves created by rising air bubbles, summer, Saglek Fjord, Labrador, Newfoundland, Canada

Juergen Freund / Green turtle underwater breathing out bubbles of air {Chelonia mydas} Indo Pacific

Stephen Downer / John Downer P / Siamese fighting fish mating - female lays eggs beneath air bubble nest blown by male. After fertillisisng the eggs, the male collects the eggs in his mouth and spits them into the bubbles (Resolution...