The drilling equipment of China's 35th Antarctic expedition at the Kunlun Station in Antarctica on Jan. 12, 2019. (Photos: Xinhua)

Aerial photo taken on Jan. 13, 2019 shows the camp of one of two inland expedition teams on China's 35th Antarctic expedition (L), China's Kunlun Station (C), and the drilling equipment (R) at the Kunlun Station in Antarctica.

Fan Xiaopeng (L), a member of one of two inland expedition teams on China's 35th Antarctic expedition, operates the drilling equipment at the Kunlun Station in Antarctica, Jan. 12, 2019.

Photo taken on Jan. 12, 2019 shows the newly-drilled ice core on China's 35th Antarctic expedition at the Kunlun Station in Antarctica.

Members of one of two inland expedition teams on China's 35th Antarctic expedition operate the drilling equipment at the Kunlun Station in Antarctica, Jan. 12, 2019.

Members of one of two inland expedition teams on China's 35th Antarctic expedition handle the newly-drilled ice core at the Kunlun Station in Antarctica, Jan. 12, 2019.

Members of one of two inland expedition teams on China's 35th Antarctic expedition maintain the drilling equipment at the Kunlun Station in Antarctica, Jan. 12, 2019.

A member of one of two inland expedition teams on China's 35th Antarctic expedition works at the Kunlun Station in Antarctica, Jan. 6, 2019.