How Do They Do It?

Experts reveal how the metal behind the fastest plane ever is made, how letters get from one end of the UK to the other in just 24 hours and how regular cars are modified to race the most dangerous outdoor circuits in the world.

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.

Turbine blades are designed and manufactured for some of the biggest jet engines in the world. Elsewhere, the world's largest telescope photographs the edges of the universe, and weapons are made that stun without killing.