Deep-sea organisms are creatures that live in the ocean's depths, typically below 200 meters (656 feet). These organisms have adapted to extreme conditions, such as high pressure, low temperatures, and complete darkness. Examples include anglerfish, giant squid, and deep-sea jellyfish, which have unique features to survive in their environment. Many deep-sea organisms rely on chemosynthesis, a process that converts chemicals from hydrothermal vents into energy, rather than sunlight. This allows them to thrive in areas where sunlight cannot reach. Other adaptations include bioluminescence, which helps attract prey or communicate with others, and specialized body structures to withstand the immense pressure of the deep ocean.