This project includes the following work: Excavation work in the area of entries/exits, bunkers and main trench. Installation of precast concrete elements. Wooden covering of the precast concrete elem... This project includes the following work: Excavation work in the area of entries/exits, bunkers and main trench. Installation of precast concrete elements. Wooden covering of the precast concrete elements. Install gravel basalt by manual excavation. Install 2 ea hand grenade bunkers.