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The development on the underwater (UW) communication network for sea observation is on the rise due to increasing importance of its applications such as oceanography, marine commercial operation and military surveillance. This paper gives overview of several underwater communication network projects conducted by active member for the ocean studies such as U.S.A., Canada, Erope, and Japan. The UW projects for shallow sea observation include SEAWEB and PLUSNet, and deep sea observation project includes GEOSTAR. The network architecture and communication method for each project mentioned above are described in this paper. As introducing various kinds of projects, this paper can be a guidance for future research on underwater network project.