Don’t worry–nobody’s actually planning one. However, if I had an extra CAN $11,921,682.49, I could dig one. That’s what the Tunnel Boring Machine they used to bore (as in dig, not depress) the Channel Tunnel is going for on eBay:
This 580 tonnes monster machine is a prized relic from the greatest construction achievement of the 20th century, the Channel Tunnel. With 227 double-headed rock picks tipped with tungsten carbide and a top revolving speed of 2.38 rev/min, this TBM removed a half million cubic meters of chalk and soil in creating the Eurotunnel route. Although no longer fully operational, this enormous piece of engineering folklore will be of interest to science museums and technical enthusiasts around the world looking for a slice of history during the tenth anniversary of Eurotunnel’s opening. The TBM is currently located at the Eurotunnel terminal in Folkstone.
Bummer about the non-functioning part. I’ll bet you could make a really cool townhouse out of that thing. If you do buy, make sure you’re happy with it. As the ad says, ‘returns not accepted’.
DarrenBarefoot.com 
Buyer pays shipping I assume?
Just think–you could make your own hobbit city with that thing!
Shipping? Just drive, er, tunnel it!
There was an hilarious ( but expensive ) episode during the building of the tunnel.
The machines were apparently supplied in kit form ( Japanese I think, ) and were welded together on site – i.e. down the hole . . .
One of the first machines was found to be the wrong size. Doh! ( only after it had been welded together ! ) It wasn’t practical to gas-cut it apart again and haul it back to the surface, so they steered it to one side, bored into the rock, and then filled the hole with concrete. Still down there.
Will make an interesting archaeological find Circa 5020
As being a Newbie, We’re permanently exploring online for articles which can be of support to me. A lot of thanks