Winners and finalists in the 2018 Underwater Photographer of the Year contest showcased a wide range of subjects and perspectives—from a split photograph of a pair of crossed swans to a startling portrait of an unlucky fish being devoured by a luminescent jellyfish. The annual competition, held since 1965, is based in the UK and open to photographers worldwide. Judge chairman Peter Rowlands shares with Colossal that a free downloadable yearbook is available, compiling this year’s top photographs.