A tunneling shield was used many, many decades ago to dig the deep-level "Tube" lines of the London Underground as well.
For anyone touring this part of the world, I can thoroughly recommend using the Channel Tunnel. It's much smoother and quieter than either the London Underground or the New York Subway, and very quick.
All the formalities are handled at the boarding end, so if you're going through with your car you just drive off the train at the far end and straight out onto the motorway/autoroute.
Great if you're not a good sailor, like me!