Floris van Breugel / Glass beach at sunset - a former dump site, in which the glass has now become pebbles of sea glass. MacKerricher State Park. California. USA. January 2013

Michael Pitts / Mike de Gruy, underwater camerman, in Remora submersible, Mediterranean

David Shale / Male and Female glass shrimps on Glass sponge (Hexactinellida) from coral seamount, SW Indian Ridge, Indian Ocean, December 2011

David Shale / Glass squid {Teuthowenia megalops}, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Piglet squid {Helicocranchia sp} from between 500 and 200m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Deep sea Glass squid {Cranchia sp} from Mid-Atlantic Ridge

Ashley Cooper / Lighthouse on Lundy Island, Devon, England, UK, June 2006.

Ashley Cooper / Campbell Stokes Sunshine Recorder, which measures hours of sunlight at Base Orcadas, an Argentine scientific station in Laurie Island, South Orkney Islands, Antarctic Peninsula.

Alex Mustard / Close up photo of a Glass goby (Coryphopterus hyalinus) on a coral reef. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Franco Banfi / Commensal / Glass anemone shrimp (Periclimenes brevicarpalis) on Sea anemone, Pura Vida House Reef, Dumaguete, East Negros Island, Central Visayas, Philippines, Pacific Ocean.

Alex Mustard / Veined octopus (Amphioctopus marginatus) in den in a discarded glass jar. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Tony Wu / Small octopus (Octopus sp) peering out of a discarded glass bottle in the muck of Lembeh Strait in North Sulawesi, Indonesia