1116-41494 - Slate pencil sea urchins (Heterocentrotus mammillatus) colour the hard coral in this Hawaiian reef scene with three free divers, Molokini Marine Preserve off the island of Maui, Maui, Hawaii, United States of America
1116-41500 - Two men free diving over a Hawaiian hard coral reef with slate pencil sea urchins (Heterocentrotus mammillatus), Hawaii, United States of America