Photo taken on Aug. 20, 2020 shows an end of the Wenming East tunnel in Haikou, south China's Hainan Province. The Wenming East tunnel, connecting downtown Haikou and the Jiangdong New Area, was put into use on Thursday. (Xinhua/Pu Xiaoxu)

Aerial photo taken on Aug. 20, 2020 shows an end of the Wenming East tunnel in Haikou, south China's Hainan Province. The Wenming East tunnel, connecting downtown Haikou and the Jiangdong New Area, was put into use on Thursday. (Xinhua/Pu Xiaoxu)

Photo taken on Aug. 20, 2020 shows an end of the Wenming East tunnel in Haikou, south China's Hainan Province. The Wenming East tunnel, connecting downtown Haikou and the Jiangdong New Area, was put into use on Thursday. (Xinhua/Pu Xiaoxu)

Photo taken on Aug. 20, 2020 shows an end of the Wenming East tunnel in Haikou, south China's Hainan Province. The Wenming East tunnel, connecting downtown Haikou and the Jiangdong New Area, was put into use on Thursday. (Xinhua/Pu Xiaoxu)

Photo taken on Aug. 20, 2020 shows the Wenming East tunnel in Haikou, south China's Hainan Province. The Wenming East tunnel, connecting downtown Haikou and the Jiangdong New Area, was put into use on Thursday. (Xinhua/Pu Xiaoxu)

Photo taken on Aug. 20, 2020 shows an end of the Wenming East tunnel in Haikou, south China's Hainan Province. The Wenming East tunnel, connecting downtown Haikou and the Jiangdong New Area, was put into use on Thursday. (Xinhua/Pu Xiaoxu)

Photo taken on Aug. 20, 2020 shows the Wenming East tunnel in Haikou, south China's Hainan Province. The Wenming East tunnel, connecting downtown Haikou and the Jiangdong New Area, was put into use on Thursday. (Xinhua/Pu Xiaoxu)