—The ability to effectively communicate underwater has numerous applications, such as oceanographic data collection, pollution monitoring, disaster prevention, assisted navigation, tactical surveillance applications, and exploration of natural underwater sea resources. In this paper, we have developed a completely decentralized ad-hoc wireless sensor network for the ocean pollution detection. We mainly emphasize on the deployment of sensors, protocol stack, the synchronization algorithm and the routing algorithm in order to maximize the lifetime of the network and also to improve its Quality of Service (QoS). Keywords – Network Architecture; Protocol Layers and Planes; Synchronization Protocol; Routing Protocol; Network Lifetime; QoS