September twenty eighth，Have“World-class challenging project”The Shantou Bay Tunnel was officially completed and opened to traffic.。Total tunnel length 6.68 kilometers，It is the first large-diameter shield submarine tunnel located in 8 degree seismic intensity area in China.，It is also the first one in China to use super-large diameter shield to cross complex strata.、Large diameter shield subsea tunnel with the greatest comprehensive difficulty。Its opening will greatly shorten the travel time from 40 minutes to less than 10 minutes on both sides of the bay in Shantou.。