Mega Builders Season 2

E1: Moving Mountains

A rescue tunnel is needed to free one of the world's largest machines stuck in the world's longest tunnel in the Swiss Alps.

E2: Roller Coaster

Following the construction of the longest, fastest and tallest roller coaster, the Tatsu, located at the Six Flags Magic Mountain in Valencia, California.

E3: Madrids Big Dig

Under a sweltering sun in the heart of Madrid, Spanish construction workers are working non-stop on the largest highway project in the world.

E4: Sinking Wings

For 15 years, Canadian diving enthusiasts have been trying to turn the coastal waters off southern British Columbia into the wreck-diving capital.

E5: Bangkok Bridge

A look at the complex construction of the new 13km double span bridge in Bangkok, Thailand.

E6: Crossing the Colorado

In a rugged canyon, down river from the Hoover Dam, a team of construction veterans is building the biggest concrete-arch bridge on the continent.

E7: Extreme Elevation

As the awesome mega-project goes under the hammer, a look at how the Burj Dubai in the United Arab Emirates is set to become the tallest building on Earth.