The world's largest tunnel boring machine (TBM) is the Herrenknecht S-317 (Shanghi) with a shield diameter of 15.43m. see the related links for more info (videos & photos & data) BUT there is some dispute: on the web there is this quote: The biggest ever built was used to excavate Gotthard Base Tunnel - 19 meters ... The Worlds Largest Hard-Rock Tunnel Boring Machine - STRABAG AG-. However, as of January, 2009, I am unable to find further info about this reference.
The largest ones go for up to $45 million brand new
Yes, the 16 km long combined Oresund bridge&tunnel is connecting Swedens 3rd largest city, Malmö, to Denmark's Capital, Copenhagen.
nor way tunnel
Tunnel sheilds are used to hold it up.
The Earth's largest railroad tunnel is the Seikan Tunnel in Japan, which is over 33 miles long. When the Gotthard base tunnel in Switzerland is opened in 2016, Seikan Tunnel will be the second longest.
Vienna is the largest city in Austria and has a population of over 1.6 million.
Japan
Fusselbank
the eurostar in london
The second largest underwater tunnel in England is the Mersey Tunnel, which connects Liverpool with the Wirral Peninsula beneath the River Mersey. It is a vital transport link for the region, accommodating both road and pedestrian traffic.
AustriaVienna is the capital and largest city of Austria.
Bodensee
"What are the provincial state or territorial capitals of Austria?"
Germany
Vienna with a population of 1,550,123
Lake Neusiedl.