![The French Channel Tunnel Crossover was created by first building a cavern around two rail tunnels which were then dismantled Stock Photo - Alamy The French Channel Tunnel Crossover was created by first building a cavern around two rail tunnels which were then dismantled Stock Photo - Alamy](https://c8.alamy.com/comp/AG82FG/the-french-channel-tunnel-crossover-was-created-by-first-building-AG82FG.jpg)
The French Channel Tunnel Crossover was created by first building a cavern around two rail tunnels which were then dismantled Stock Photo - Alamy
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)