Project Impossible

As humans push even further into the world's most extreme environments, the question is: how far can we go? A new breed of tools allows man to face deadly forces once thought impossible. On this episode: polar survival suit; thermal imaging fire fighter mask; big wave surfing emergency vest.

The past does not give up its secrets easily. Brand-new machines are helping explorers reveal mysteries once thought lost forever. Underwater archaeologists are searching for a World War II Nazi sub that disappeared in U.S waters. In Scotland, researchers are digging up an ancient rock, covered with cryptic markings, that could reveal more about who built Stonehenge. On this episode: German Submarine U-576; Cochno Stone; LIDAR.

A revolution in engineering is making today's technology as outdated as the horse and buggy. On this episode: world's fastest production motorcycle - Lightning LS-218; a "train" faster than the speed of sound - Hyperloop; the world's first nuclear fusion power plant - ITER.

America has a history of building the impossible. Across the nation, a new generation of impressive projects is underway. On this episode: New Tappan Zee Bridge; Los Angeles Subway; New Orleans pump station; Mount Rushmore preservation.