Submersible vehicles are specialized crafts designed to operate underwater. They can be manned or unmanned and are used for various purposes, including scientific research, exploration, and underwater construction. These vehicles are equipped with advanced technology to navigate and gather data in deep-sea environments. Many submersibles are built to withstand high pressure and extreme temperatures found in the ocean. They often feature cameras, sensors, and robotic arms to assist in tasks like studying marine life or inspecting underwater structures. Notable examples include the Deepsea Challenger, which reached the deepest part of the Mariana Trench.