sensors Article A High-Efficiency Uneven Cluster Deployment Algorithm Based on Network Layered for Event Coverage in UWSNs Shanen Yu, Shuai Liu and Peng Jiang * College of Automation, Hangzhou Dianzi University, Hangzhou 310018, China; shanen_yu@hdu.edu.cn (S.Y.); liushuaihdu@163.com (S....