How Do They Do It?

Astronauts train for the weightlessness of space without leaving the ground, toxic chemicals are removed from car exhaust fumes and fire fighters extinguish vast forest fires in some of the most inaccessible areas on the planet.

The crew of a nuclear submarine reveal how they stay safe during a fire. Later, the science behind the world's most advanced crash test dummies and a multi-million dollar greenhouse that provides produce year-round are explored.

Massive mining machines are made to be mobile, while one of Europe's largest warehouses has to organize and house 350,000 car parts and boats are built to navigate the swamps of Florida.

Investigators show how they retrieve and analyze the data stored on an airplane's black box. Then, workers transport a massive steam turbine halfway around the world and fireproof suits are made to protect race car drivers.