Cutting-edge tech and the latest science are helping engineers build record-breaking bridges that push construction to brand-new heights, and experts reveal the secrets of how these megastructures are being built. This is a mashup of S02E02, "World's Tallest Bridge" (Millau Viaduct) and S05E09, "Himalayan Mega Train" (Qinghai-Tibet Railway).

The U.S. Navy's most innovative and powerful ships are built using cutting-edge engineering and the latest tech, and inside access to these modern marvels reveals how they were built. This is a mashup of S05E07, "U.S. Navy's Aircraft Carrier" (Ford-class) and S02E07, "U.S. Navy's Super Submarine" (the Virginia-class).

The world's biggest and baddest ships are built with cutting-edge engineering and the latest naval technology, and inside access to these modern marvels reveals how they were built. This is a mashup of S05E07, "U.S. Navy's Aircraft Carrier" (Ford-class) and S03E03, "World's Biggest Ship" (Pioneering Spirit).

Engineers at Virgin are building the world's first hyperloop train system, an innovative high-speed technology that uses magnetic levitation to travel over 600 miles per hour and transform transportation as we know it.

New York City is building an 11 billion dollar construction project to extend the busy Long Island Railroad, and using brand-new technology, engineers and builders blast bedrock to create a vast tunnel below Grand Central Terminal.

Experts use cutting-edge tech and bold engineering to build a record-breaking bridge that spans a deadly chasm in a remote section of the Himalayas. When completed, it will be the world's tallest railway bridge, towering almost 1,200 feet high.

When engineers built a cutting-edge railroad to navigate the South American Andes, they used cutting-edge tech and engineering to conquer its deadly heights. This trailblazing train sets new records on one of the most dangerous routes in the world.

The first railroads in the United States were engineering marvels built to conquer America's deadliest places. Using cutting-edge science, engineers and builders changed the nation by connecting the California frontier with the rest of the country.

When engineers built railroads across the swamps of New Orleans, they used cutting-edge technology and methods to get it done, and these extreme trains attest to the innovative engineering required to conquer the most challenging water environments.