Recently,national priority project and Chinese first submarine tunnel in speeds up in the construction between Xiamen and Xiang'an, constructs progresses smoothly at present. Xiang'an's submarine tunnel is important channel that connects Xiamen and Xiang'an, tunnel span 3141 meters,total invests 324million Yuan,The plan will be completed in 2009 is.It is reported that the tunnel is the biggest cross section at present in the world