The saltwater chlorocytus split from its ancestor, adapted to salt water and moved to the sea and further south to the glacier. It swims in the salt water under the ice, though the largest populations can be found in cracks and holes in the glacier where water touches air. Its ‘eye’ has developed further, enabling it to detect smaller quantities of light. This is especially useful under the glacier, because it helps to move towards the cracks and holes where it gets its sunlight. Apart from light, though, it can now also use salt to produce energy. It also developed a new organ that can store energy for later use. Because of these abilities it can survive for a short time without sunlight.