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He made a video reacting to the thunderclaps in the Radiohead song “Creep,” and once again, a million views in a day.

A local resident told Yonhap that he had been watching television at home when the explosion, which sounded "like a thunderclap", shook the house.

The historic nature of that thunderclap moment wasn’t lost on the 34-year-old entrepreneur.

I tested every handhold for loose rocks and moved only in the thunderclaps of cannon fire as they echoed in the gorge.

“It was like that feeling you get from a thunderclap, but it just kept going.”