Channel Tunnel: The 20th century's most expensive construction project — but worth every penny | by Gareth Dennis | Medium
How did they manage to build the Channel Tunnel in only 6 years, while the Gotthard Base Tunnel or Brenner Base Tunnel of similar length took 15-20 years? - Quora
![Channel Tunnel: The 20th century's most expensive construction project — but worth every penny | by Gareth Dennis | Medium Channel Tunnel: The 20th century's most expensive construction project — but worth every penny | by Gareth Dennis | Medium](https://miro.medium.com/v2/resize:fit:1358/1*XB6srBd6GLy_4w6yDbtKPQ.png)