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How can steel repair itself? How do they create the world's most powerful bikes? And how is wood transformed into paper.

Find out how they make military helicopters, how they design metro systems and how they engineer artificial reefs.

A newly qualified driver has a monthly budget of £150 to spend on her first car. Helen and Paul help her pick out a stylish and practical supermini.

Artisan baker Chris wants to ditch his diesel Audi and use part of his pension to fund a dream upgrade. He's hoping for a sports car with lots of power.

Drew and Paul rescue a classic: a Vauxhall Viva. The car was extensively modified in the 1960s but after years in storage, it's well past its best.

Presenter Henry Cole and motorcycle restorer Sam Lovegrove scour the UK's sheds for hidden vintage automotive treasures to fix up and sell on.

Henry and Sam are in the heart of Oxfordshire where they find rare Minis, 1970s Rollers, and a pristine rally car - but can they get her running.

Richard joins the crew of one of the biggest moving objects on earth, the Marie Maersk container ship, on her continuous 28,000-mile voyage from Asia to Europe.

Derek finds a 1937 Chevrolet Deluxe that's been off the road for 20 years. But can it make the 150-mile drive to the General Motors headquarters in Detroit.

Chad Hiltz helps his friend James to build a promotional truck to help sell his cider business. The team uses a 1934 Desoto Airflow as the base for the new car.

Double Trouble. Ant buys two Jaguar XJS, hoping one can donate spare parts. But with brake problems and the gearstick floppy, are they just double trouble.

In California, a dam collapse causes chaos. In Massachusetts, the tallest library starts cracking. In Italy, a vital bridge comes crashing down.

Paul has paid just over £15,000 for an Alfa Romeo 2000 GTV that appears to be in great shape. However, Drew is horrified when he learns it's an automatic.

At the Ridler tech test, Dave and Kev scramble to fix a transmission problem. When the show opens, they get their first chance to see the competition.

Mike snaps up a Jaguar S-Type with 195,000 miles. After some repairs, the boys put it up against another model with just a tenth of the miles.

Henry and Sam are on the west coast of Cornwall. Sifting through 50 years of vintage vehicles, they find the first-ever Lotus Elan and a pre-war Sunbeam.

Henry and Sam are in Oxfordshire, checking out a shed full of oversized items. Henry likes a tractor in blue and Sam falls for a Midget racer in a hedge.

Chris gets behind the wheel of a WRX supercar, as he joins the grid in Spain on a quest to earn FIA championship points.

Chris is driving and jumping a vehicle unlike anything he has ever driven before -a monster truck. He has his hands full with the five-ton monster.

The guys unearth a rare 1958 Land Rover Series 1 in a shed full of junk. Then, they transform a 1972 Mazda Bongo van into a micro-home for millennials.

In California, a catastrophe cuts one of America's most vital highways in two. In Texas, a refinery explodes with deadly consequences.