The image is a diagram of a tunnel construction site. The diagram shows a cross-section view of the tunnel, with two main sections labeled as "TIN CHI" and "TIN PHU." The tunnel is shown to be under construction, with a yellow line indicating the progress of the work. There are also two yellow lines representing the boundaries of the tunnel, with one line on the left side and another on the right side. The diagram includes a blue arrow pointing towards the right side, possibly indicating the direction of the tunnel's progress.