Underwater submersibles are specialized vehicles designed to operate beneath the surface of the water. They can be manned or unmanned and are used for various purposes, including scientific research, exploration, and underwater repairs. Submersibles are equipped with advanced technology, such as cameras and sensors, to gather data and capture images of marine environments. These vehicles can dive to great depths, allowing scientists to study ecosystems and marine life that are otherwise inaccessible. Notable examples of submersibles include the Alvin, which has explored the Titanic wreck, and the Deepsea Challenger, which reached the deepest part of the ocean, the Mariana Trench.