In pictures: Stunning shots from Underwater Photographer of the Year contest
These spectacular images are just some of the winning photographs from the Underwater Photographer of the Year contest for 2017.
The competition attracted entry from underwater photographers from 67 countries.
The main prize was given to Gabriel Barathieu for his portrait of an octopus in shallow water in a lagoon on Mayotte Island off east Africa.
Hong Kong photographer So Yat-wai won the macro sections with his photo of a mantis shrimp larvae moving in on possible prey that was taken during a black water dive in Anilao, Philippines.