Twenty meters down colours are not what you’d think they might be. Reds are the first to leave followed by orange, then yellow and finally green.

The world down here amid the broken bones of the Clan Ranald wreck is blue and grey and shadow. A fantastic monochrome world of detail, texture and landscape.

Shine a bright light on coral or sponge or on curious school of bullseyes and moments of red, orange, yellow and green remind that there is so much colour down here, just hidden.

Take out even the blue and this imposing gorganian coral is just as beautiful in monochrome as the deep red it hides from the world.