Ocean is one of the concerning research these days. Many marine applications seems comparatively slow in exploiting the information communication technology. In this paper, new UW-Hybrid architecture for 2D and 3D communication is proposed for underwater acoustic sensor networks. The objective of this paper is to highlight the drawbacks in the existing architecture of underwater networks. This paper also focuses on the research issues of different layers in the protocol stack of underwater networks. Cross layer protocol stack is one of the solution of above given problem is explained briefly here to compensate for possible limitation in the layer interface.