THREE MINUTE TEASER

In 1954, disaster struck again when a third Comet jet airliner crashed, throwing the future of commercial aviation into question.

Unravel a chain of critical events in the hours and minutes before the 9/11 attack.

When flight ASA529 crashed after one of its propellers failed. The investigation found the cause of the failure was corrosion.

A neighbourhood is destroyed in East Los Angeles, wreckage, still on fire, is strewn for blocks.

Fire breaks out in the cargo hold of a 747 heading for South Africa and there’s only one way to clear the smoke – open the...

Wayne County Jail, Detroit, is targeting habitual femail offenders, for help, not punishment.

Watch as a selection of history's most gruesome projectile weapons are tested for their accuracy and deadliness.

Discover how weapons have been used to smash skulls for centuries in Skull Smashers.

This time the Planet Mechanics are tackling one of the world’s biggest problems, traffic pollution.

The next morning, and the whole bike has to be stripped down to get to the heart of the problem.

Jem’s working on the mounts for the air tanks. They’re coated with carbon fibre, a material that can’t be welded. He...

It’s not nearly as much as Jem wanted so he’s ordered the best air motors he can find, but these motors are normally used...

Dick and Jem have come to this scrap heap to collect an old vehicle to recycle.

So they’re building a moped powered by fresh air. They’ll replace the petrol engine with an air motor and the gas tanks...

Fortunately they still have the oil they made earlier. So it’s time for the ultimate test: will that oil fire up the grain...