(CNN) — When it comes to bragging rights, Czech photographer George Karbus has more than his share.
Not only does he have a girlfriend who joins him when he goes freediving with jellyfish, a shot he took of her swimming with the creatures has scooped him one of the top prizes in a leading photo contest.
Seven other stunning photographs from 12,000 entrants were named as finalists.
The overall winner will be announced on February 13 at the Telegraph Outdoor Adventure & Travel Show in London.
The contest is sponsored by UK-based "Outdoor Photography" magazine and Swedish outdoor equipment company Fjällräven.
The prize for the overall winner from the adult categories is a place on a dog sled expedition to the Arctic in spring 2016.
Now in its fifth year, the competition honors what organizers say is photography showcasing the magnificent diversity of our planet, with the 2015 category winners covering everything from a remote Pakistan schoolroom to a spectacular Australian thunderstorm.
The winning photographers come from the UK, Australia, Austria and the Czech Republic, with 15-year-old Anastasia Ziavra from Greece taking the Young Photographer of the Year prize for her moonlit picture of a beach.
This year, 150 of the best entries have been gathered into a book by Ammonite Press, with descriptions written by the photographers and details of the cameras used.