https://jjcit.org/paper/66 10.5455/jjcit.71-1562930035 Kamal Kumar Gola,Bhumika Gupta Void avoidance,Sensors,Coverage,Connectivity,Surface station,Holding time,Quality of Service (QoS) parameters. 12 6710 1824 2019-07-12 16-Sep.-2019 and 21-Sep.-2019 2019-10-08 Underwater sensor networks (UWSNs) have become among the most interesting research areas, since they open the door wide to researchers to conduct research in this field. There are so many issues in underwater sensor networks. The most serious issue is the void region that degrades the performance of networks. It is an issue, where a node doesn’t have any forwarder node to forward the packets to another node. Here, the objective of this work is to avoid the void region. For the same purpose, this work proposes an algorithm named “An Energy-Efficient Quality of Service (QoS) Based Void Avoidance Routing Technique”. The proposed work uses two-hop node information to avoid the problem of void region. This approach uses depth information, distance to next, holding time and residual energy as Quality of Service (QoS) parameters in order to find the best forwarder node to forward the data packets to their destination. The proposed algorithm has been implemented in MATLAB. Results show a better performance in terms of packet delivery ratio, energy tax and number of dead nodes as compared to Energy-Efficient Void Avoidance Routing Scheme for Underwater Wireless Sensor Network (E2RV).