The busy ports of Dalian and Yantai are located on either side of the Bohai Sea, about 170 km (106 miles) apart.  The driving time by road around the bay is about 16 hours.  Engineers are planning the world's longest undersea tunnel to shuttle freight traffic between them.  It would span the opening to the bay, similar to San Franscisco's Golden Gate Bridge. At 123 km … [Read more...]