A man with white shirt is standing in front of a machine.  He turned around and pointed the machine.  The machine is being shown.  A man who is wearing a white shirt keeps talking, while behind him a man in gray shirt walked and reach something in the machine.  The man in gray shirt put a powdery stuff in the machine.  He is shaking the bag.  The man in white shirt is putting cement on the wall.  The man is holding a blue long tube pointing on the wall.  The man in gray uniform used the tube/pump and spray the cement on the wall.  An old man is smoothing the cement on the wall.