As if walking across a glass-bottomed walkway around a cliff wasn't scary enough, a group of Chinese tourists were left terrified on Monday afternoon after one of the glass panes started to crack right under their feet.

A tourist who was on the walkway at the time, Lee Dong Hai, snapped a photo of the nearly shattered glass and posted it to the Chinese social media website Weibo. The post was later removed.

“I was almost at the end, and suddenly I heard a sound. My foot shook a little. I looked down, and I saw that there was a crack in the floor."

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Yahoo News reports that the U-shaped platform is attached to a cliff at Yuntai Mountain Geological Park in Henan Province, China. It's suspended 3,543 feet above the ground.

"Everybody was screaming," wrote Hai. "I screamed out, 'It cracked! It really cracked!' and then I pushed the people in front of me so that we could run out of the way."

The glass cracked after a tourist dropped a stainless steel mug on the walkway, according to the Yuntai Mountain tourism bureau. There are three layers of glass and only one broke, so the bureau says the tourists were in no danger.

The walkway had just opened last month and will be closed until further notice.

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