Manned submersibles are small, underwater vehicles designed to carry people into the depths of the ocean. They are equipped with strong, pressure-resistant hulls to withstand the extreme conditions found at great depths. These vehicles often have large viewports for observation and are used for scientific research, exploration, and underwater tourism. These submersibles can be operated remotely or by a crew on board. They are equipped with various tools and instruments for tasks such as collecting samples and conducting surveys. Notable examples include the Alvin submersible, which has explored the Titanic wreck and deep-sea hydrothermal vents.