Discovery Channels’ Extreme Engineering explores audacious engineering possibilities. The Extreme Engineering web site (broken by phb organization that can’t even keep a web page alive forget actually doing amazing stuff, so I removed it) provides a view of some of the exciting projects engineers have worked on like the new subways for New York City and Hong Kong’s airport. And it also shows some possible future projects like a transatlantic tunnel (image above) which would float in the ocean and carry trains, pipelines…. Trains could run in a vacuum and travel at 6-8,000 kph (taking under an hour to travel from New York City to London. Of course there are quite a few engineering and economic factors to deal with to make something like that a reality.