How can animals survive in the deepest parts of the sea?

rganisms that live in the perpetual darkness and extreme pressures of the deep sea have a variety of) has eyes the size of dinner plates. In the total darkness found past 1,000 metres, many deep-sea animals have evolved light-producing organs that are used either for recognition or as lures to catch prey. With no phytoplankton available as a primary food source, the inhabitants of the deep must rely on a slow, steady rain of waste food particles from above or hunt and scavenge in the darkness. Sometimes a shipwreck, the carcass of a large organism such as a whale or the trunk of a tree will arrive on the seabed and the slow pace of life is transformed as a range of animals take advantage of the nutritional bonanza, which can last a number of years.