The Binhai Avenue Tunnel, with a total length about 1,560m, is laid flat and shallowly buried on the main and auxiliary tracks, with in-situ sinking and stacking layout. The south and north auxiliary roads of the subsidence-style tunnel are arranged in staggered layers and the "two-in and two-out" special ramps are set up respectively in combination with the development of the Super Headquarters base to connect the Super Headquarters underground road network system, forming an underground threelevel road system of "underground express road + underground ring road + plot garage" to ensure the large-scale traffic demand of the Super Headquarters base and create an efficient underground transportation System.