Underwater devices are tools and equipment designed for use beneath the surface of water. They can include a variety of technologies such as submersibles, underwater drones, and sonar systems. These devices are often used for exploration, research, and monitoring marine environments. Many underwater devices are equipped with cameras and sensors to collect data about underwater ecosystems. They play a crucial role in fields like marine biology, oceanography, and environmental monitoring. By providing valuable insights, these devices help scientists understand and protect aquatic life and habitats.