Li Yongjun's 21-year-old son, Pan Yuehong, was among the 14 buried at the construction site

I was working near the site when there was a huge noise like exploding fireworks. I didn't realize my son had been buried until I was called by a co-worker.

I could see him through the steel bars, and we used all our strength to lift many bars off him. His face was already cold when we managed to pull him out.