Richard and Jonny prove the effectiveness of the concrete bomb versus conventional explosives in their biggest and most...
(03:26)In 1954, disaster struck again when a third Comet jet airliner crashed, throwing the future of commercial aviation into question.
(01:00)Unravel a chain of critical events in the hours and minutes before the 9/11 attack.
(00:52)When flight ASA529 crashed after one of its propellers failed. The investigation found the cause of the failure was corrosion.
(02:35)Fighter jets track a 737 high above Athens, more than 100 people are on board but who is flying the plane?
(01:01)A neighbourhood is destroyed in East Los Angeles, wreckage, still on fire, is strewn for blocks.
(01:02)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...
(01:16)Wayne County Jail, Detroit, is targeting habitual femail offenders, for help, not punishment.
(00:52)Welcome to the Youthful Offenders System, the best chance for Colorado’s violent teens.
(01:01)Watch as a selection of history's most gruesome projectile weapons are tested for their accuracy and deadliness.
(01:34)Discover how weapons have been used to smash skulls for centuries in Skull Smashers.
(01:41)This time the Planet Mechanics are tackling one of the world’s biggest problems, traffic pollution.
(02:12)Now it’s time for Dick and Jem to proudly reveal their new thoroughbred delivery vehicle to the expectant new owners.
(04:55)The next morning, and the whole bike has to be stripped down to get to the heart of the problem.
(02:55)Jem’s working on the mounts for the air tanks. They’re coated with carbon fibre, a material that can’t be welded. He...
(02:55)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...
(02:55)The next morning and the Planet Mechanics’ eco-workshop is up and running. Dick and Jem are in the south of England on their...
(02:52)Dick and Jem have come to this scrap heap to collect an old vehicle to recycle.
(02:52)So they’re building a moped powered by fresh air. They’ll replace the petrol engine with an air motor and the gas tanks...
(02:55)Fortunately they still have the oil they made earlier. So it’s time for the ultimate test: will that oil fire up the grain...
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