The deep sea refers to the part of the ocean that is below 200 meters (656 feet) in depth. This region is characterized by high pressure, low temperatures, and complete darkness, making it a unique environment. It is home to a variety of organisms, many of which have adapted to survive in extreme conditions, such as bioluminescent creatures and giant squids. Exploration of the deep sea is challenging due to its inaccessibility. Submersibles and remotely operated vehicles (ROVs) are often used to study this mysterious habitat. The deep sea plays a crucial role in the Earth's ecosystem, influencing climate and supporting diverse marine life.