Mega Builders Season 2

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.

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

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

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

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

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.

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.