Submersibles are small, underwater vehicles designed to explore the depths of oceans and lakes. Unlike submarines, which can operate independently for long periods, submersibles are often tethered to a support ship and are used for specific missions, such as scientific research or underwater inspections. They can be manned or unmanned and are equipped with cameras and sensors to gather data. These vehicles are crucial for studying marine life, underwater geology, and shipwrecks. Notable examples include the Alvin submersible, which has made significant discoveries in the Mid-Atlantic Ridge and explored the wreck of the Titanic.