The term "underwater sensor network" (USN) refers to a system of interconnected sensor nodes and vehicles that work together to complete an underwater mission. The sensors and vehicles in autonomous networks operate independently of any central control. Since water makes up 75% of Earth's surface, the network may adapt to marine environment characteristics to help it reach its objective. Submerged resources are plentiful. Those have to be looked at more. Opportunities to conduct underwater investigations utilizing sensors at all levels have arisen as a result of recent technological advancements. In order to achieve its intelligence, smart sensing, and communication capabilities, USN combines wireless technology with a very small micromechanical sensor technology.