How do they build things like tunnels and bridges underwater? – Helen, age 10, Somerville, Massachusetts When I was a kid, I ...

The first underwater tunnel was built with a tunnel shield ... Tunnel workers gather the muck as it pours in. They toss the wet earth on conveyor belts, which carry the excess mud out of the ...

The immersed tube method, a version of the cut and cover technique, is a cheap and easy way to construct a tunnel under water -- and it's generally the fastest way. Here's how it works: Dredging ...

A record-breaking tunnel is being built under the Baltic Sea between Denmark and Germany, which will slash travel times and ...

In the south of Denmark a mega project is underway to build a tunnel under the Baltic and providing ... for a spin. So rare they were thought to be a myth and undertake arduous journeys of up ...

Catherine Austin Fitts, who worked under the first Bush administration, claimed the US has built secret underground cities.

Spain has begun investigating the possibility of connecting Europe to Africa via an underwater ... the Channel Tunnel linking France to the United Kingdom was built for £5 billion in 1994 ...

The building is made from hexagonal and triangular modules which connect together above and below the water using a series of walkways and tunnels ... will prevent the underwater sections from ...