The Channel Tunnel is one of Europe's biggest infrastructure projects ever.
It is 31 miles long, and on average 150 feet deep under the seabed.
The Tunnel has three tubes (2 for rail and 1 for service) which were
dug by 13,000 engineers and workers and costed $15 billion to build.
Channel Tunnel is undoubtly the fastest way (when there is no delay)
of travelling between London and Paris/Brussels: you could take a day trip to Paris and back. London Waterloo to Paris
Gare du Nord is 3 hours and
Brussels Midi/Zuid is 3 hours and 15 minutes.
Timetables and fares avaliable at
Eurostar web site.