There’s more to tunnels than meets the eye – and not just because they’re under cover! Here’s five questions about these engineering marvels.
- From 1906 to 1982 the longest railway tunnel in the world was in the Alps. What is its name?
- The Channel Tunnel incorporates the longest stretch of undersea tunnel in the world, at 37.9 km (23½ miles). What’s the average thickness of earth between it and the sea bed?
- The three tunnels dug for the mass escape from German prisoner-of-war camp Stalag Luft III in March 1944 (The Great Escape) were called Tom, Dick and Harry. Which was actually used for the escape, and how long was it?
- The Marmaray Tunnel opened this month, connecting Europe and Asia. Where?
- The Umeda Exit of the Hanshin Expressway’s Ikeda Route in Osaka incorporates a short tunnel. Why is it unusual?