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The localization of non-localized nodes is a crucial task in the underwater communication. The significance of localization is largely due to its role as a basic building block of several other capabilities, including the tagging of the monitored data, co-ordination of a group of node’s motion and the detection of the position of underwater targets. Moreover, the localization of nodes also helps to adjust the routing protocols and medium access and facilitates processes like geo-routing. On the whole, the localization of sensor nodes is an inevitable procedure to get useful location-aware data.