https://iblog.iup.edu/gyyt/201....6/06/07/all-about-bu
https://www.webwiki.de/cogcont....ainersltd.com/tunnel
The Versatility of a Container Tunnel Tunnels are crucial for transporting cargo from and to major cities. Truck drivers could save time and fuel if they could build tunnels that ran straight from ports to points just outside the high-population areas. Double-door shipping containers, also referred to as tunnel containers, have doors at both ends. This makes it easy to access the contents of the container