The deep ocean refers to the part of the ocean that is below 200 meters (656 feet) and extends to the ocean floor. This area is characterized by high pressure, low temperatures, and complete darkness. It is home to unique ecosystems and organisms that have adapted to extreme conditions, such as deep-sea fish, giant squids, and bioluminescent creatures. The deep ocean covers about 65% of the Earth's surface and plays a crucial role in regulating the planet's climate. It also serves as a habitat for diverse marine life and is a source of valuable resources, including minerals and hydrocarbons. Scientists continue to explore this vast and largely uncharted territory to better understand its significance.