The section of the 2-kilometer “Zheleznitsa” tunnel under construction on the Struma Highway, where rocks collapsed yesterday on three workers, is extremely complex in terms of terrain and land structure.

The high moisture from recent rains is the reason for the crumbling rock to fall on people. This was what the executive director of the contractor company, Stefan Totev, said. He pointed out that the inspection of several institutions and the contractor's experts did not reveal a technological or human error.

The condition of the three injured workers is stable and their lives are out of danger.