Jaydip M. Kavar, Dr.K.H Wandra
In our earth 75% covered by water that could be river and ocean also. The underwater sensor network are enabling technology and become more and more popular for monitoring vast area of oceans. Underwater sensor Networks consist of a variable number of sensors that are deployed to perform monitoring tasks over a given area. The UWSNs provide countinuous monitoring for various applications like ocean sampling network, pollution monitoring, submarine detection,disaster prevention,etc. In this paper, we discuss the internal architecture of underwater sensor,we discussed the literature of underwater sensor network,different architectures for two-dimensional and three-dimensional underwater sensor networks are discussed, we also discussed the application and main problem or issue in underwater sensor network.