The world of macro marine photography is full of life and colours and action that many new divers simply swim on by.

However for photographers and those who take the time to look nudibranchs make wonderful subjects due to their diversity of colour and form.

This bulldozer of a sea slug, Ceratosoma brevicaudatum, may only be 5cm in length but is quite imposing up front.

Not to be outdone however a tiny little amphipod has photobombed the scene and stolen the limelight.

Photo: Robert Rath, ‘Photo Bomb’, 1/100s f/14 ISO320 100mm