http://www.nzta.govt.nz/site-resources/content/about/img/media/tmb1.jpg
This puppy is costing the NZ taxpayer $54 million.
Herald article:
http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10869584
I think that four of these machines made by German company Herrenknecht were used to bore the world's longest railway tunnel in Switzerland - 57 km!