The machines that were used to dig the Channel Tunnel, known as tunnel boring machines (TBMs),, played a crucial role in its construction and were treated in different ways after the project was completed.

　　1. Buried Underground : Several of the tunnel boring machines (TBMs) were left underground after their job was done. Since they were enormous, disassembling and removing them would have been costly and impractical. Some of these TBMs were sealed off in specially dug caverns or were simply abandoned in place.

　　2. Disassembled for Parts : In some cases, parts of the TBMs were disassembled and removed. Components that could be reused were salvaged, while other parts were discarded.

　　3. Display and Preservation : Some parts of the TBMs were preserved and are now on display. For example, the cutting head of one of the machines is on display at the Eurotunnel terminal in Folkestone, UK, as a reminder of the impressive engineering feat involved in the construction of the tunnel.

　　The Channel Tunnel was completed in 1994, and its construction involved 11 TBMs in total, each weighing hundreds of tons. These machines played a critical role in digging the 50.5 km (31.4 mi) tunnel, one of the longest undersea tunnels in the world.