The subsea tunnel is a better transport facility with the characteristics of all-weather capability, and has the advantages of no damage to shipping, does not affect the landscape, and is not covering or less demolition, not affected by strong wind or heavy fog weather. "Bohai Strait cross-sea channel" was listed in national, provincial and city scientific research project in 1993. This paper analyzes necessity and feasibility of the construction of Bohai Strait cross-sea channel and discusses the primary selection of routing position from the national strategic and basic construction condition of Bohai Strait cross-sea channel, based on document investigation and mastery of the practical data. Building on the authors' own work, this paper talked about the framework of Bohai Strait cross-sea channel’s preparatory work from a technical point of view, and provides reference for next step of research.
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