Rescue is still underway for the 13 workers trapped in a tunnel that collapsed Sunday night in southwest China's Guizhou Province.

A scene from a collapsed tunnel near Shiqian County in southwest China’s Guizhou Province on August 11, 2014. [Photo: cqrbepaper.cqnews.net]

Rescuers say they will implement a three-stage plan to rescue the workers who are trapped 600 meters deep in the tunnel near Shiqian County.

Luo Qiang is a deputy director of the provincial transport department.

"The first step is to drill an 11-cm horizontal bore to provide oxygen for the trapped workers. The second step is to drill a pilot tunnel with a cross section of four square meters in the middle of the right side of the collapsed section. The third step is to drill a four-meter-long inclined pilot tunnel near the exit."

The trapped workers have received several mobile phones and sent out letters through a narrow opening.

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