Why did the Shenzhen subway stop?

In the early warning issued at 2 1: 20 on September 7, 2023, Shenzhen Meteorological Observatory announced that the accumulated rainfall in Luohu District, Futian District, Longhua District and Longgang District in the past three hours has reached the level of rainstorm. In addition to the weather warning, Shenzhen Metro also issued an emergency operation announcement, which had a considerable impact on citizens' travel. According to the announcement, due to the adjustment of traffic organization, the services of Huanggekeng Station and Yuyuan Station of Metro 16 Line were suspended.