Channel Tunnel: Construction of the World's Longest Underwater Tunnel - The Constructor

Channel Tunnel: Construction of the World's Longest Underwater Tunnel - The Constructor

How Do You Build a Tunnel Underwater?

Seikan Tunnel, Japan - Railway Technology

The Channel Tunnel - Robbins

Channel Tunnel - Wikipedia

The Top 10 Most Expensive Construction Projects in the World

Tunnels and underground excavations, History, Methods, Uses, & Facts

Channel Tunnel: The 20th century's most expensive construction project — but worth every penny, by Gareth Dennis

How the world longest underwater tunnel was built

Building the world's longest undersea tunnel: 'No man is an island, entire of itself

Channel Tunnel surveyors used satellite positioning and computer-aligned lasers to ensure the undersea tunnels met in the middle Stock Photo - Alamy

What are the limits of how long and deep an underwater tunnel can be built to be usable for railway and road traffic? - Quora

How the Channel Tunnel Was Built and Designed

How exactly did they ensure that the Channel Tunnel would meet in the middle? - Quora

Can Norway win the global race to build a 'floating tunnel'?