Richard Hammond Engineering Connections Hong Kong International Airport

where do you put a huge new airport in a jam-packed city like Hong Kong the solution call for one of the biggest construction projects of the 20th century just how crazy would you have to be to build one of the world's busiest airport here right in the middle of the sea and in the heart of a typhoon sir it's a crazy idea that only became this due to some clever engineering no no however just wouldn't have been possible without a world war two bomber a Cold War spy bug correct an 800 year old water pump a brass band and the vintage racing most people who pass through Hong Kong's Chek Lap Kok Airport have absolutely no idea what it took to build it thank you fifteen years ago I couldn't have done this well not without a wetsuit the land for Hong Kong's new airport had to be created it was one of the biggest reclamation projects of the 20th century and it couldn't have been done without a 13th century water that land wasn't there the roads the runways the buildings the aircraft none of it it was all just see but what led engineers to take on such an epic task in the 1980s Hong Kong was growing fast the old airport Kai Tak was struggling to come as passenger numbers rocketed and Kai tax Airport was famous for its perilous approach hot jet engine that's one way to dry your washing the city needed a new airport but where there's just no good free space the city is squeezed between the mountains on one side and the sea on the other with space being such a rare and precious commodity the residents of Hong Kong have long since learned to be very creative with how they use it but for this project the engineers came up with a plan that would make even these guys think twice engineers looked out to see they set about blasting and leveling to islands off the coast of Hong Kong check Lap Kok and Lambchop the plan was to join them and create one big iron out of the blasted rook except the seabed between the islands was soft marine clay up to 20 metres deep which isn't exactly the right stuff to build on in fact it would be pretty stupid if millions of tons of rock and sand were dumped on top the airport could sink into the sea the island needed a firm foundation so they had to get rid of the clay all of it engineer is called in the world's largest fleet of dredges ships to suck it all up the dredges work like giant vacuum cleaners and they rely on a connection that was invented in what is now Turkey 800 years ago back then the ruler wanted to turn arid land above a river into lush green fields it sounds like the beginning of some fantastic ancient fairy tale you know the kind of thing whoever manages this incredible feat gets the hand of the Kings daughter in marriage or is banished forever if they mess it up undaunted a genius inventor called al-jazari took on the challenge of moving water uphill he created the world's first automated suction pump professor Al Hassan II is an expert in ancient technologies and this pond is just what I need to see this pump in action it's made from 21st century materials but it works just like Al Jazeera's 13th century design so this is the resulting in that well not this exact one obviously this is a replica so what is it this is supposed to be a suction pump so this is a suction but is well what angle they didn't have BMXers in 1206 well for signaling that BMX bikes so what's that here to represent in this this actually represents the waterwheel that was driven by a river so the same river that supplied the water that was gonna be pumped uphill to distribute to towns and villages actually supplied the power to do exactly and I'm guessing that has to be peddled by somebody and I'm guessing you're not doing it well okay yeah I'll get the last thing I was expecting this morning was a workout so this piston is the heart of the machine just like a swing it sucks in water through a pipe from the pond then drives it out through the chamber and up the outlet hose at the top the flat valves mean the water can only go in one direction of course and if you can suck up water you can suck up mud you'll see that now it's clear water coming out and being pumped but as we disturbed the soil in the riverbed then the sediments will go up with the water and hence we have the beginning of wedging all al-jazari wanted to do was water some fields but his pump made an airport in the sea possible never did find out whether he won the hand of the king's daughter because made that bit up what was good for al-jazari in the 13th century was good for hong kong in the late 20th just as LJ's lead pub sucked up water the dredging team at chaplet sucked up sludge from the seabed then they did it a bit faster 10 tonnes a second for two years you need a lot of bicycles for that and over those two years the dredges hoovered up enough mud to fill 28,000 Olympic swimming pools the clay was too spongy for landfill so the sludge had to be dumped out at sea with all the mud sucked up engineers had a stable base on which to build and by 1995 the island for Hong Kong's new airport was complete building Hong Kong International Airport in the South China Sea solved the problem of space but an airport at sea would expose aircraft to some dangerous weather Hong Kong International Airport sits in the pathway of deadly typhoons but meteorologists can easily see a typhoon hundreds of kilometers wide as it races in it was in fact an invisible threat to planes that airport designers we worried about there is another kind of weather that can ambush unwary pilots and it can be lethal for planes precisely because it is less predictable its windchill wind shear is any localized change in wind speed and Hong Kong International Airport is located in a high-risk zone positioned between mountains in the ocean normal wind patterns don't apply rapid wind changes can affect the amount of lift on aircraft wings causing planes to accelerate or stall catastrophic aircraft can literally fall out of the sky or be blown off course in 1998 this Thai Airlines Boeing triple7 attempted to land at Hong Kong's old Airport it's a smooth descent until a flame is blown off course just seconds before touchdown landing on just one set of wheels successfully this time but wind shear can be fatal in the last 60 years over 1,400 people have died in accidents caused by this invisible threat fortunately planes in Hong Kong are protected from windshield and incredibly all because of a connection to a brass band a scientist called kristoforas boys ballot asked a brass band to help him test Christian dopplers revolutionary theory that you can detect if something is moving towards you or away from you by measuring a change in frequency it was over 150 years ago that players perhaps like these were used to demonstrate a scientific principle that we take for granted nowadays but that back then had to be explained and demonstrated and proven it was 1845 and what the scientists did was put halt players on a train because we have to get the horn players moving very quickly toward us and then away from us for this to work 150 years ago of course scientists didn't have health and safety forms to fill in now there's no way I was going to be allowed to risk these young people to prove a theory luckily we've got other things in the modern world that'll do the job it doesn't play a tune but it does make noise and it moves fast now listen carefully to the sand of the engine as it gets closer and then further away but more is it makes changes but it doesn't just get louder and then quieter it changes in pitch it's called the Doppler effect it works like this the plane produces sand waves when it travels towards us the waves bunch closer together changing frequency and creating a higher-pitched sand as the plane flies away the sand waves stretch out and the frequency and pitch change again but what does the Doppler effect or Doppler shift have to do with detecting wind shear those fast potentially deadly invisible currents of air well using dopplers principle Hong Kong pioneered an advanced wind shear warning system and the airport's first line of defense is 12 kilometers from the runway check the app is right the way over there on the horizon you'd have to sort of trust me that it is but it is you can just see the towers over here this is part of its wind shear and turbulence warning system and yeah it is distant but because of the water it's got clear line-of-sight this radar detects wind shear by looking for water droplets usually rain the radar waves bounce off the droplets and back to the tower the airport can tell whether the rain is moving away from or towards the radar by measuring the change in frequency of the waves that bounce back just like the sand of the plane changed as it flew past pilots can be alerted of big changes in frequency that can signal dangerous wind shear even up this close there's no sense that this mute blank structure is watching but it is 24 hours a day it's giving pilots flying into and out of Chek Lap Kok over there the comfort of knowing that someone has got an eye out for them should mother nature decide to make things tricky but what if the water droplets are too small to detect or the airs too dry this Doppler radar is as good as blind so Hong Kong International Airport went a stage further and pioneered a new way of using Doppler shift to detect the invisible threat anything that moves and makes a noise can produce the Doppler shift that's why you can hear it police sirens aeroplanes are a band on a train but it's not limited just to noise you can also detect the shift in another waveform light and the special kind of light is the key to Hong Kong's are the use of Doppler right a little experiment I think what I want to try and do is detect see wind chip what I have here obviously is an enormous fan now I know that that fans on and creating a continuous stream current well because I just switched it on but what if there was no fan and you couldn't tell how would you know there was there because you can't see it air is invisible and that's what presents the danger to aircraft so I'm going to ask Steve over here to see if using your helicopter you can tell me whether that fan is on like a long straight level Oh No ah fumbles on there yeah it was definitely on come here the fan off please thank you now I'm not gonna pretend that what just happened there came as a surprise obviously it didn't but what if the pilot in a helicopter oh dear have been able to see that current of air that wind shear it wouldn't come as a surprise things might have ended differently well at Hong Kong they do have a way of making the invisible visible and it all relies on the fact that the air around us although we think of it as being just empty and invisible is full of millions of tiny particles I don't mean the specks of dust you might see in a shaft of sunlight through a window I mean microscopic particles you could fit 200 of them across the width of a human hair and if you can see those moving then you can see air currents moving let me demonstrate turn on the fan right so that's our current of air that's the wind shear I shall now introduce some particles to yeah minutes it's kind of working it is kind of working but I think we can do better by making an improvement what I need to improve is the light obviously the sunlight in here that's why you can see me but I need I need some specific light that I can control so let's fire up the fan please first of all that's that's our wind shear I'm moving current of air now introduce if you will the microscopic particles well the flower yeah but if I shine the light torch all of a sudden where the light is reflected back of this moving car I can see it if I turn it off really nothing nothing at all with the light as particles moving and that's gong let's cut the bank please obviously they don't have people wandering around with big bags of flour to introduce particles into the air they're already there it says microscopic particles remember that are all around us and they don't use torches they use lasers but it's still light and it's from this unassuming box on the airport roof that the light comes it's a laser called lidar I'm taking a look inside with airport meteorologist mr. chan Wow so electric shed what's this - it's a measuring winds the community over the airport it detects particles too small to be found using Doppler radar does it do that all the times it is stopped is doing fine dispersion continuously and detecting wind shear continues the over there even now as we're inside it's still using a lineup yeah yeah in fact lidar is so accurate it can provide precise wind speeds up to ten kilometres away Hong Kong International Airport was the first to use Doppler this way keeping aircraft safe from wind shear Engineers could tick the box for getting planes in and out of Hong Kong's new airport safely all thanks to a brass band all that remained was to build one of the world's largest enclosed spaces for the new terminal the breeze except by now the clock was ticking Hong Kong was due to be handed back to China by the British government the project had to be completed before the handover giving the engineers just three years to build one of the world's biggest airports but the fast approaching deadline wasn't the engineers only here in Hong Kong the designers were aiming to be very big they wanted to create one of the biggest enclosed spaces in the world and they wanted it to be light and airy a big space requires a big roof at 700 metres wide and over a kilometre long this was no ordinary the airport architects insisted on a jaw-dropping design mirroring the rolling waves of the South China Sea it was an engineer's nightmare a roof this size would need lots of muscular columns to take its weight but the architects didn't want heavy weight structures cluttering up their light spacious terminal this is a huge space with almost nothing to stop passengers moving around free this is one of the pillars holding up the roof the next one is all the way over there and in the other direction it's all the way over there those are huge spans so how do such a small number of thin columns support a big roof the answer make the roof really light how much trouble is a light roof isn't usually strong funnily enough making something light and strong is what plane designers have to do all the time for the solution the designers looked to the heavens and found inspiration in the world war two bomber it's the Wellington a twin-engine British bomber used for nighttime raids over Germany in the Second World War the crucial thing about the airframe was its strength British engineer Barnes Wallis had found a revolutionary way of making a frame light and strong it looks more holes than metal and the secret was in the way he arranged the material it's not about the amount of metal you use but how you use it I've devised an experiment at my workshop to show how with steel less can be more okay if we're ready let's try and get it down but let's get it between the bars I don't get just anyone to be my technical adviser Martin Manning was the chief structural engineer at Hong Kong International Airport okay can we get there yep first we're going to load up a standard I beam used in buildings all over the world with two and a half ton in weight about the same as two family cars so here we go as the chain' slackens the beam takes the full load safe ending huh yes yes I cancel this 130 kilo beam is holding up just what happens when we increase the weight to three and a half tonnes here we go so it's slacking her off and have a look take the load off the crane so when the change start to go slack my word that is not liking it a top don't take it a new cover that's failed isn't it that's broken that is seriously Griffin that never even one airing the steel beam fails completely at three and a half tonnes you could give this be more muscle by bulking up but that would also make it heavier and they didn't want that at Hong Kong amazingly we can send the i-beam on a diet and still make it stronger think Wellington bomber the answer lies in simple geometry so there are things you can do with just the same amount of material the same weight but organized in a different way to different shape of your correct absolutely and that's we're gonna do next yep we better tie to this that beams really really broken spawns or the trouble yeah taking a cue from Barnes Wallace's Wellington design ivory organized the steel into a series of triangles this lattice beam weighs almost 20 kilos less than the i-beam yet it should be stronger if the maths is right the load is spread through the lattice so it won't bend or so Martin tells me and you think this will be strong just because of the shape the arrangement so I'm going to test Martin's confidence and load it with a much heavier weight right let's have the lot on all of it we're loading up every slab we can find that's four and a half tons a ton more than the i-beam could hold remember this lattice weighs less than the i-beam okay that's legs down so watching slacking off at this point the i-beam just folded that's not moved at all there we are now it's four tons of concrete and half ton of steel and that's now happily supporting what fall-off turns and it's not even that's content yeah that's correct in turn the other one easily failed thrilling to say it was safer gentle courtesan it's nearly twice the loan and we couldn't be any clearer good so that shows how you arrange the steel makes a huge difference to the strength our lattice was composed of very strong triangles just like the Wellington bomber and a curved lattice of steel also made of triangles was exactly what the engineers needed to span the terminal roof in Hong Kong each 36 meters span could be bridged with just one huge but light lattice structure it supports itself without the need for hefty pillars getting in the way leaving the space free for passengers like me to roam around but of course the building is just the shelf for the business of getting passengers onto planes next you need the stuff inside that makes it work stuff like baggage handling and the designers didn't want an ordinary system they wanted to go one better than other Airport Hong Kong International Airport carries 40 million or so bags a year and three and a half million tons of cargo keeping track of it all is an immense task when you check in for a flight you really want to be confident that your bags are gonna come off the same aeroplane as you at the other end of your journey and clearly the designers here at Hong Kong Airport realize just how much having that confidence matters and capacity's airports around the globe rely on barcodes to identify a bags destination and own but barcodes have a success rate of only 85 percent that means Hong Kong could lose six million bags a year not counting half a million tons of cargo that would be a long queue at the lost luggage counter the designers wanted to do better so engineers had to pioneer a more advanced system they wanted technology that allowed bags to be scanned at a distance and with greater accuracy and they turned to a Cold War device for inspiration Moscoe 1952 a security sweep revealed a bug at the American Embassy hidden in a replica of the Great Seal presented by the Russians over six years before it was a revolutionary passive device operating without any kind of internal power supply baffled the CIA called it the thing but with no sign of a battery to power the bug how was the signal being transmitted the answer provided the solution to creating Hong Kong's new baggage handling system when a Russian spy fired a specific radio frequency at the thing it powered up the microphone and broadcast the ambassador's secret and the similar passive device sorts luggage in Hong Kong but how well funny enough spy bug technology is useful for sorting other things that don't know where they're going sheep here at a farm deep in the British countryside farmer Richard Webber manages his flock with a passive device just like the thing so what are we going you got an ear tag yeah which is a visual tank and a microchip and that is the mic that's the heart of the hole that's the microchip when you excite that it gives you the automatic number that's the key to this entire sister I'm actually going to ID one of these lambs yeah I'm going to do yeah we are we're gonna put her once it's got that identity that's its ID number for life yeah means well we will link it through the handheld to the mother so if you would like to add the lamb and we'll greet you yes okay and I'll put the Tiger nuts here you can have your ear pierced my heart was very fashionable right now we're gonna lead a microchip right and that microchip is talking to the handheld and that day is gonna feed the information let's tighten it and now it's asking what is it a boy or girl it's not labeled is it and well if you look between it oh excuse me um it's a it's a boy I believe okay so we hit the RAM on here yeah and then it says what breed is it sheep normally it's a Suffolk if it's got a black face right all so it's a Suffolk and all done so from now on whenever that machine ignites these things yes this thing into action it'll identify itself a little trigger all of that yeah so the luggage the sheep has been tagged with a radio frequency identification chip or RFID tag for short but how does this tag help a farmer sort of flock of thousands aivars Richard to divide some sheep into three groups according to their value and we'll mix them all up and find out if we can sort the sheep back into their original pens what we've done is we put a color collar on to show you that these are the Sheep that should go into that pen right so they're sorted into we've got yellow colors yeah red colors on that pen and no colors at all in there we'll mix them up and then we'll run them through the auto drafter we call it and it will read the chip and decide which pen it should go in so we're gonna mix all of these three groups out this device here that's going to salt the mat again that's right ah I like the confidence you'll excuse me fine testitude is it I just had a devious idea yeah I'd like to do before mix it up well that's to be expected first I have to catch a sheep which actually is neezy I want to check this machine is reading the microchips and someone isn't herding the Sheep by looking at the collars the only thing to do is mix up some collars and see if the sheep are still sorted accurately so where's a sheepdog when you need no want to go in rigid okay make a noise like a steak I don't make a noise like a stick doesn't make a noise does it right that's the three groups thoroughly mixed and now we're gonna sort them yep I'm guessing with this yep okay here we go it's a yellow cop now if it's a genuine yellow collar sheep it should go straight on door opens and it sent that one straight ahead yep this is sort of hypnotic watching it's all red Reds that's correct this sheep sorter sends a radio wave to activate the ear tags passive microchip exactly like the spy bug the tag replies with its number and the computer checks its records for the sheep's value then decides where to send the Sheep regardless of Colin you're not doing anything no you could actually go and have some lunch if you wanted so the advantage of doing it this way is it can be done at a distance you don't have to be there all read a barcode it just they talk to one another automatically and sort them that's right and it it is accurate it's so accurate that I'll bet your hundred quid that your yellow color and your red collar is in that pen there will be one without the collar in that pen and there will be one without the collar than that thing farmer just bet me money I'm not gonna break that all right phone everything that confident will see if it has work okay okay so it's the red collar and a yellow colour in here I can see the yellow one already that's the yellow color yellow colour here and the red ones despite me mixing up the collars Richard's RFID chip sorting system soon saw through my cheating so it's all about information and it's all about readability and well it's a system very much like this that would without the lancing it's obviously that allows them to handle the baggage at Hong Kong International Airport without that's in handy Hong Kong was one of the first airports to replace barcodes with RFID tags to track backs thanks to Soviet spies the luggage can be sorted accurately at high speed 40,000 every 24 hours getting to the right plane 97% of the time well my bag is safely on his way to my plane and very shortly I shall be joining just time I think for a coffee and perhaps some shopping in a terminal with so much space there's no shortage of room for retail therapy but the size of this building posed another problem for the airport engineers remember those typhoons these severe tropical storms have their own internationally recognized scale of destruction at the top of the scale category five wind speeds can escalate to 250 kilometers an hour these typhoons rigged haven't in Hong Kong sending everyone running become hurricane-force winds also caused problems for big buildings with high flat sides exactly like this one to protect Hong Kong's new airport from destruction engineers looked to another type of transport and found the answer in a 1930s racing car engineers knew the solution had to be strong enough to keep the building together but just how strong did it have to be thinking about the kinds of pressures these buildings have to stand up to and we could look at the numbers all day long bad they actually feel what happens want to find out about that I've come to the one place where I can be in control of the weather a wind tunnel a really really big winter I've asked engineer David Wain to let me play in his expensive wind tunnel Dave so what's the fastest wind this teller can generate 130 kph 80 mile per hour so that's about hurricane strength as it eases and you're prepared to fire it up and let me stand it I just want to feel what that feels like yeah if you're quite happy to do that then yes why are you smiling like that well I will it will it blow me over at that speed it is quite likely to you if you're not bracing yourself if you're not expecting it then yes it will knock you over right we then blow me to the other end of the wind tunnel where I'll come out like chips no hopefully not once once you're on the floor and that's it you shouldn't go any further okay okay well this is this is just about feeling feeling that pressure that these buildings have to put up with so the name of science switch it on whilst I never all I want to do is just get a real physical feeling of the kind of forces in a typhoon now Whitney is a typhoon and it's breezy gladwyn easy put a mattress strapped to the floor behind me David signals the wind speeds already up to 40 kilometers an hour 70 kilometers an hour that's gale force tree freshly No that's as a blood was a whole building the pressures on pages in this David cranks it up to a hundred kilometers an hour humbly as well that I don't wear a toupee it's not long before we're hitting 112 kilometers an hour 130 kilometers an hour this wind tunnels top speed this is equivalent to a category one typhoon just imagine a category five almost double this speed well I think I made report yeah sometimes numbers there is hard enough and you just gotta experience something physically for yourself and all like that there was wind moving air could be very very powerful stuff even when you're just a small bloke if I was the size of a huge building the pressures would be incredible the walls were reinforced to cope with the immense loads unfortunately for the engineers strong winds stress the roof in a different way every aeroplane using this Airport relies on one thing to get into the skies left and one of the secrets to creating that lift lies in air moving quickly across a surface that terminal roof is a very big surface add in some fast-moving air and there's the potential for a very very big problem back at the wind tunnel I'm gonna find out what happens to a curved roof when it's hit by a typhoon strength wind I have here a small building but it's very small but I have more to the point over here a roof and it's got a profile a bit like the one at Hong Kong and I kind of I understand the theory is that because of this shape it'll work like an aircraft wing and that'll generate lift and it'll be lifted up off the building but I kind of need to feel that happening for myself so I've got the roof I've got the building I've got the wind tunnel to make the wind going over the top after that experiment coming up I've got to get in the small building okay I mean I mean it's basic but it's home right I need my roof now please I can find out just how it feels right ah yes one important feature this is quite an expensive facility we're in so just in case it does lift the roof off I'm chaining it in place so it can't fly through the expensive fans at the end of the winter all right one of those well then okay remember this wind tunnel can reach wind speeds of a category one typhoon 130 kilometers an hour let's see if that's enough for this roof to fly well think you can see how the wind curves its way over the roof but as yet that isn't resulting in any lift 40 kilometers an hour and rising now it's getting windier Maroof still on this whole wall is vibrating as the winds hitting it face-off Oh something happened there Oh and just over 55 kilometers an hour this roof takes off the state you can just feel the lift it passes a critical point and then voila the roof just wants to take off it feels like a wing well the big bad boobs didn't get in what I could feel that was the to stress is facing a building in a strong wind because initially there's the wind just hitting the side of it there and it wants to just collapse the building that way and then suddenly when the wind grew and grew and grew there came a point when the roof was at peril it wasn't it was just been blown that way was actually being lifted up so that's two very distinct and separate stresses on a building one this way collapsing the walls and the other lifting the roof off that's a problem one way to hold a flyaway roof is to lock it down tight but this would call for a beefy building precisely what the architects didn't want the airport engineers came up with a better idea and the key was flexibility thanks to a pioneering joint from a 1930s racing car there it is that is silver arrow and 1930s Mercedes racing car and it featured a revolutionary new form of suspension the Mercedes had been pioneering probably one of the things that helped it dominate the 1937 Grand Prix C's but no sooner had that suspension been pioneered then it cascaded down from racing cars like that to more ordinary everyday cars and you can still see in use today and there it is it's a wishbone a wishbone is a triangle of strengthened steel it only allows movement up and down stopping the wheels from moving in any other direction back in my workshop I've come up with a little demonstration to pit flexibility against stiffness there is an old fable about a sturdy oak tree being blown down in a storm and a tiny Reed surviving it because it could Bend with the wind well I've devised a little illustration to prove how flexibility can be a greater defense than sturdiness and that of course was the solution at Hong Kong International Airport here it is this is well car obviously not mine what I've done is weld up the suspension it's now solid the link between the wheel and the car there's no flexibility in there at all that's enough words I think we should just get on with this illustration so lift it up please I'm gonna move another way okay well if everything set and drop it rudia yeah I think we can see what's what's happened here it's the suspension where it's mounted to the car because there was no flexibility it was just solid and sturdy where we welded it up has has come through the bonnet it's ruined so that was that was the sturdy approach there's try flexibility now this car is flexible now will it survive my stress test now this car has fully functioning suspension I'm not gonna sell it to you I'm just pointing out that this one has the flexibility that the other one didn't so let's go through the same process and have a look what a difference it makes take it up I've just cleaned it well right then let's do it drop it well it landed definitely gravity did that bit question is what kind of state is it in well it it's still flexible hang on all of these are voting well you see the flexibility helped it weather the storm but does it still work and I guess as the final proof we should really see if it still works the cars wishbone inspired airport designers to join the roof and walls making a flexible joint allowing for movement during typhoons but unlike the cars wishbone Airport engineers had to design for three movements not just one the roof lifts like an aircraft wing so the wishbone allows for up and down move but wind blasting the glass walls translates into a sideways movement so it also has a sliding mechanism for even greater flexibility and knuckle bearing links the wishbone to the sliding bar a total of 1,300 wishbones allow the building to flex and move in typhoon winds thanks to a vintage racing car so my flights been caught and I'll board my plane know that my bags been stowed safely and the plane will take off safely job done for the engineers at Hong Kong s some 800 flights takeoff and land at Hong Kong International Airport every day transporting over 48 million passengers each year as planes take to the skies very few travelers will have any idea of what an engineering achievement this Airport relieves but it wouldn't have been possible without an 800 year old water pump a brass band a Cold War spy bug a world war two bomber and a vintage racing car

Channel: Documentary Viko

Views: 159,716

Rating: 4.5424609 out of 5

Keywords: documentary finance, documentary films 2015, documentary funny, documentary future, documentary gangs, documentary game, documentary germany, documentary gold, documentary god, documentary geology, documentary greek mythology, documentary gangster, documentary gypsies, documentary hd, documentary history channel mysteries, documentary hbo

Id: Ou2tHj8mrFc

Length: 50min 4sec (3004 seconds)

Published: Fri Feb 05 2016