Even as the mercury dropped well below freezing, enthusiasm soared among about a dozen hardy swimmers during a daily ritual in northeast China’s “ice city” of Harbin.

The swimmers trained daily throughout the year for this.

They first carved out a pool in the Songhua River, breaking the 10-centimeter (4-inch) thick layer of ice that had formed again overnight and scooping out the pieces. Then they stripped down and, one by one, plunged into the bone-chilling waters of a pool about 10 meters (30 feet) long.

Some said their limbs were already numb in the -13 C (8 F) weather.

Chen Xia, who came from Zhejiang province about 1,700 kilometers (1,000 miles) to the south, dived into the river even though she had a cold. She said the winter waters in her home city are warmer than those in Harbin, where the water temperature hovered around the freezing mark.

The experience strengthened her confidence in winter swimming, a sport she has been devoted to for about two decades.

“I felt prickling all over my body,” said Chen, 56. “But it still made me feel blissful."

Harbin resident Yu Xiaofeng said that winter swimming in her city can be dated back to the 1970s, after locals saw Russian Orthodox faithful being baptized in the river. The city is near the border with Russia. In 1983, Harbin's winter swimming association was established.

The city is considered a “holy land” for winter swimming, she said, as the sport gained popularity here earlier than in other parts of China. Harbin is also known for its ongoing winter festival, which features giant ice and snow sculptures, and smaller, delicate ones too.

Yu, 61, said she found a sense of a big family and joy during her three decades of swimming.

“Since the pandemic, we came up with a slogan: Rather suffer through winter swimming than line up at the hospital,” she said, adding that winter swimmers appeared to have better health than others.

You Decang, 76, said that swimming kept him healthy and he had never caught a cold.

"If I go just one day without winter swimming, I feel quite uncomfortable,” he said.

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Olivia Zhang and Caroline Chen contributed to this report.