The goal of this study is to design the Enhanced Sun Based Low Energy Adaptive Clustering Hierarchy protocol (ESBLEACH), which can increase the network lifetime in Underwater wireless sensor networks (UWSNs) by minimising the amount of energy used. Here, solar energy (photovoltaic) is utilized for energy harvesting with external powersources to the sensor nodes. This solar-powered external power system is used to extend UWSNs' network lifetimes. The major goal of the suggested technique is to choose efficient routes to a terminal as well as cluster heads (CHs). The proposed approach integrates two main procedures, namely the Coati Optimization Algorithm (COA) based leach protocol for multi hop routing. The COA approach choose CHs in addition systematizes clusters related on dissimilar constraints like absorption loss, spreading loss, propagation sound, ambient noise, signal-to-noise ratio, transmission loss, and propagation delay.