In pics: Wormhole Library in Haikou Bay, S China's Hainan

Photo taken on April 12, 2021 shows the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)

Photo taken on April 12, 2021 shows the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)

Photo taken on April 15, 2022 shows the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)

Photo taken on April 16, 2022 shows the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)

Aerial photo taken on April 16, 2022 shows the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)

Aerial photo taken on April 15, 2022 shows the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)

Photo taken on April 16, 2022 shows the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)

Photo taken on April 15, 2022 shows the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)

People read at the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province, April 16, 2022. (Xinhua/Zhang Liyun)

Photo taken on April 15, 2022 shows the Wormhole Library in the Haikou Bay in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)