In the field of civil engineering, people are most afraid of encountering underground caves when filling cement. Because the underground cave is very huge, no matter how much cement is filled into it, it is futile. However, compared with the sea, the underground caves are very small. But China pours tons of cement into the sea. What? Why did China do this? What are they going to build now? In fact, China threw 10,000 tons of cement into the sea to build the Pingtan Strait Road-Rail Bridge. According to data
