SUBMARINE (submersible vehicle)

A submarine is a specialized underwater vessel designed to operate below the surface of the water. It can be used for exploration, research, military purposes, or undersea operations. Submarines are equipped with ballast tanks to control buoyancy, allowing them to dive and surface. They have pressure-resistant hulls to withstand deep-water environments and sophisticated navigation and life-support systems for crew safety. Unlike surface ships, submarines can remain submerged for extended periods, exploring or performing tasks beneath the ocean. Their ability to operate discreetly makes them valuable for scientific study, defense, and underwater infrastructure inspection.