Winners of the 2016 Underwater Photographer of the Year contest (4)

Helen Brierly shared her picture of marine life 'suspended in the inky blackness of the open ocean' (left) and Adriano Morettin from Italy said his image (right) was made using a double exposure technique performed directly in the camera without changing the lens

Gianni Colucci from Italy also captured seahorses. He said: 'During a night dive at around midnight, I found this pair of seahorses. I watched, mesmerised as they swam in the shallows holding each other by the tail. The scene was something majestic, a magic only enhanced by the beauty of the location, illuminated by the full moon'