| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | tunnel | Civil engineering in Europe | Tunnels often involve advanced safety features and are designed with sustainable environmental impact in mind. | 1 |
| 2 | tunnel | civil engineering culture | Tunnels are built to provide efficient transportation routes and may require specialized ventilation and fire protection systems. | 1 |
| 3 | tunnel construction | Civil engineering | Focuses on ventilation, stability, and safety measures in underground environments | 1 |
| 4 | tunnels | Civil engineering culture | Key components of transportation infrastructure for creating underground passages | 1 |