Watch full movie online. What is the value of ocean biodiversity? Bloody Bay Wall is the top of a five thousand foot underwater cliff. A group of divers - including scientists and photographers - gather at Little Cayman Island in the Caribbean Sea to explore this spectacular underwater feature. Motivated by questions of human biology, coral reef ecosystems, and the stunning imagery of this marine park, their collaborations help illuminate the range of what rich marine life offers to humanity: now, and in the future.