Channel Tunnel
Photograph by Vera Kratochvil

The Channel Tunnel is a monumental testament to human ingenuity and collaboration, transcending borders beneath the English Channel to link the United Kingdom and France. Its construction, spanning over six years and completed in 1994, involved intricate planning and innovative techniques to navigate through varied geological formations and the challenges posed by the underwater terrain. Comprising three tunnels—two for rail traffic and one for services—the tunnel system stretches over 31 miles in total length, making it the longest undersea tunnel in the world. Immense tunnel boring machines were employed to excavate through solid rock and clay, while specialised engineering solutions were implemented to ensure safety and stability under high water pressure. The Channel Tunnel's inauguration marked a historic milestone in international connectivity, facilitating seamless transportation of passengers and freight between two major European hubs, while redefining possibilities in global engineering endeavours. Standing as an extraordinary achievement in modern infrastructure, it is considered one of the Seven Wonders of the Modern World.