Why not build a bridge in Qiongzhou Strait?

Qiongzhou Strait Bridge will have many difficulties in span, difficulty and technology, and the capital demand is also great. In fact, the construction of this cross-sea passage should be based on engineering considerations. The nearest Qiongzhou Strait is nearly 20 kilometers, the water depth in the narrower part in the east is about 100 meters, and the width in the west is 60 meters. Therefore, it is not difficult to build a cross-harbour tunnel. If you build a bridge, you must consider the typhoons that pass here frequently every year, and the length of the bridge and the cross-harbour tunnel should be more than 30 kilometers. And it is above the sea, which is easy to form foggy weather. Therefore, we should consider the geological structure, geotechnical engineering characteristics, whether there are faults and whether there will be a major earthquake. And inspect marine hydrology, meteorological conditions, navigation safety and ecological protection.