This photo taken on May 25, 2023 shows a coral species in the waters of Fenjiezhou Island of Hainan Province, south China. (Xinhua/Yang Guanyu)

This photo taken on May 27, 2023 shows a coral species in the waters of Fenjiezhou Island of Hainan Province, south China. (Xinhua/Yang Guanyu)

Divers transplant corals in the waters of Fenjiezhou Island of Hainan Province, south China, May 27, 2023. (Xinhua/Yang Guanyu)

A tourist enjoy scuba diving in the waters of Fenjiezhou Island of Hainan Province, south China, May 27, 2023. (Xinhua/Yang Guanyu)

This photo taken on May 26, 2023 shows a clownfish in the waters of Fenjiezhou Island of Hainan Province, south China. (Xinhua/Yang Guanyu)

A diver is pictured in the waters of Fenjiezhou Island of Hainan Province, south China, May 27, 2023. (Xinhua/Yang Guanyu)

This photo taken on May 26, 2023 shows a sea slug in the waters of Fenjiezhou Island of Hainan Province, south China. (Xinhua/Yang Guanyu)

Divers transplant corals in the waters of Fenjiezhou Island of Hainan Province, south China, May 27, 2023. (Xinhua/Yang Guanyu)

This photo taken on May 25, 2023 shows orange cup corals in the waters of Fenjiezhou Island of Hainan Province, south China. (Xinhua/Yang Guanyu)

This photo taken on May 26, 2023 shows a clownfish in the waters of Fenjiezhou Island of Hainan Province, south China. (Xinhua/Yang Guanyu)

Divers transplant corals in the waters of Fenjiezhou Island of Hainan Province, south China, May 27, 2023. (Xinhua/Yang Guanyu)