How Do They Do It? Season 4 Episode release dates & where to watch

1. Forest Fires, Car Exhaust, Space Station

Go beneath the surface to understand forest fires, car exhaust and the space station.

2. Family Car, Titanium, Letter

How a spacesuit keeps an astronaut alive, the diesel engines that power the world's biggest ships, and the manufacturing processes behind the famous neon signs which cover Las Vegas

3. Nuclear Sub, Crash Test Dummies, Fruit and Vegetables

Secrets behind nuclear submarines; crash-test dummies; growing fruits and vegetables.

4. Land Mines, Air Boats, Warehouses

The world's largest land-mining machine; how airboats are built; warehouse for car parts.

5. Black Boxes, Steam Turbine, Racing Car

How black boxes survive an airplane crash; transporting giant steam turbines; making fireproof suits for race-car drivers.

6. Jet Engine, Weapons, Telescope Finale

The design and manufacturing of large jet engines; non-lethal weapons that stun without killing; the world's largest telescope.