The octopus has a horizontal slit as the opening in its eye. It alters the width of the slit depending on the outside light levels. In this closeup you can also see the coloured pigment spots in the skin. The octopus can change the size of the pigments of different colours and thus change the overall colour of the skin to match the surroundings.
The Rainbow Warrior is in the Mediterranean for a three-month ship tour taking action on the threats to the sea and calling for a network of large-scale marine reserves to protect the health and productivity of the Mediterranean Sea.