Fatal Engineering 2025 Season 1 Episode 4

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Transcript

00:00Roller coasters are supposed to be all about fun and thrill but when engineering goes wrong it can

00:10be fatal 2016 in Australia a raft capsizes on the Thunder River Rapids a tragic accident

00:18foreshadowed by perilously low water levels on the ride that would claim the lives of poor people

00:24the water levels at the loading and unloading bay have dropped beneath where they're supposed to be

00:301972 five die and another 13 are injured when a roller coaster leaves a horrific legacy the rope

00:41suddenly snaps and then this whole set of carriages start to roll backwards some passengers are

00:48projected from their seats others are crushed in the wreckage as the train folds upon itself

00:53one car at a time 2023 a replacement part intended to increase safety fails leading to a series of

01:05mechanical issues that claim the life of one rider and leaves others with serious injuries in Stockholm

01:11Sweden the front car slumps towards the track the deceleration forces three riders out of their cars

01:19what did we learn from these tragic incidents what are the reasons behind such fatal engineering

01:26Stockholm Sweden

01:39on this summer Sunday thrill seekers are flocking to the Grana Lund amusement park

01:51Grana Lund has a place in every Swedish person's heart it's in the heart of Stockholm it's a very

02:01small family park alongside its smaller attractions and music venues Grana Lund also features a handful of

02:09roller coasters of roller coasters one of these is the jetline ride

02:12built in 1988 the jetline features an 800 meter long track that rises 30 meters to its highest point

02:25the track is divided into four sections each section is separated from the other by a breaking point to

02:32ensure the permanent safety of the attraction sensors along the track would monitor the speeds of trains at

02:39various sections fast speeds recorded at a section would trigger the application of the braking system

02:45at the following break point to lower speeds each train is made up of seven cars each able to carry two

02:53riders for a total of fourteen this ride is the one you're going to go on if you go to the park it's

03:02the one that everybody's talking about and the ultimate thrill on the park 11 35 a.m 11 riders board the

03:11jetline train ready for the biggest thrill of their day so the start of the ride everything's going as

03:18normal we're going up the lift hill clack clack clack clack clack then we're down into the first drop

03:27we're picking up speed

03:35as the train passes break point one it begins to descend into a long right-hand turn

03:41little did they know that fatal engineering is about to play its part in making this the final

03:51day jetline would ever run 11 36 a.m as it rolls down a curve something breaks under the leading car

04:04turning this family attraction into a runaway train front car slumps towards the track striking

04:11raised joints that scar the underside of the train and cause it to decelerate in a violent and

04:17uncontrolled manner actually screeching along the rails and people can feel this inside so there's

04:23this horrible grating sound because of the violent deceleration passengers bodies are forced and pressed

04:31into the lap bar mechanical parts fall onto the crowd below the train continues to scrape along the

04:38jetline's central axis the whole thing reverberates along the entire length of the train as these

04:45collisions continue the deceleration that the riders and the train experiences forces three riders out of

04:54their cars the train now significantly decelerates fails to make it up the next rise instead reversing

05:02back down the track before coming to a rest most of the occupants of this terrifying ride suffer internal

05:12injuries of the three riders ejected from the jetline two are seriously injured the third dies of his injuries

05:21the park is immediately closed health and safety inspectors will come and look at the ride they

05:30will look at why there was this engineering failure it's at a forensic level all the components of the ride are

05:37inspected and re-inspected right down to x-raying welding joints and they find the culprit

05:46the cause of failure a part that's vital to the smooth operation of the roller coaster

05:54the control arm the control arms connects the main body the chassis of the roller coaster car to the

06:02track below all cars have one fixed connection except for the lead car where the connection is a little

06:09different the control arm is flexible this flexible connection enables the first car more vertical

06:15motion in relation to the track helping it to absorb more of the gravitational forces placed upon it

06:22as it enters each dip or change in the ride's elevation it's this first set of control arms that

06:28we have to worry about because that's where the fatal engineering failure is going to happen

06:34to understand why the control arm on the first car broke we need to go back three months following a

06:41maintenance inspection the decision was taken to replace several control arms that were showing signs

06:46of wear in march 2023 new arms were installed but they did not fully meet safety regulations in the original

06:57control arms a transverse plate of metal welded inside the hollow square tube of the control arm helps to

07:04strengthen the metal and also distribute tension throughout the structure in the replacement parts

07:10this additional metal plate hadn't been included meaning it was no longer as strong as the original design

07:18and fabrication in the three months following its replacement this part was put through its paces at

07:24every turn of the jetline microscopic cracks have formed and the control arm is in critical condition

07:34on the morning of june 25 2023 it reached its breaking point

07:43earlier in the day regular riders of the jetline had reported vibrations and loud noises that they felt as the

07:52train went around the track there's a bit of grating going on and a slight juddering sensation it's

07:58not like it should be behaving it's actually screeching along the rails and people can feel this inside

08:05little did they know this would be the last day those trains ever ran

08:0911 35 a.m

08:15as the jetline makes its way up the first slopes the muffled noises turn into ear-splitting screeches

08:23what the people in the train don't realize is that there's something wrong with the control arm underneath

08:2811 36 a.m as the train approaches the attraction's third incline the right hand control arm connecting

08:36the train to the track breaks on the lead car throwing it completely off balance the car drops

08:43suddenly onto the metal bars of the track as the car screeches along the track it comes up against

08:49another element of the ride's construction the joints of the track in an ideal world you'd build a roller

08:55coaster without any joints but practicality and manufacturing and assembling a ride such as jetline

09:02dictate that you need to build a ride in sections and then you join those sections together and you'd

09:09seek to join them as seamlessly as possible but wherever there's a joint you need something to hold that

09:15together the jetline was built by connecting sections of rail every four to six meters these sections have

09:23three main parts two rails on each side on which the wheels of each train roll and a central section

09:29that supports the track structure it's in this central section that we find another element that

09:35will prove disastrous to the train and its riders on the jetline there are bolts that connect the track

09:43and hold them securely together under normal operating conditions trains pass over these track connectors

09:50which are slightly raised above the profile of the center rail when the train's control arm breaks

09:57the leading car collapses violently onto the track and these raised fittings this first carriage is now

10:04dragging along this top steel tube banging into all these collections of nuts and bolts along the way

10:11each impact creates a violent shock wave across the entire structure and riders are slammed into the lap

10:18bars that should be the safety component keeping them within the car and keeping them safe these lap bars

10:26have been designed for ordinary operation and the worst thing that can happen in ordinary operation

10:32is a safety e-stop where we bring the carriage to a stop quite quickly tragically this is exactly what

10:40happens the accident investigation revealed that the arms failure combined with repeated impacts between the

10:47lead car and track joints generated forces that exceeded design limits this rapid and unexpected

10:56deceleration results in the violent breaking of the jetline train that repeated bashing bends these

11:03safety bars out of shape leaving them practically wide open it's not there to stop this kind of impact

11:09it's like being hit in the chest by a sledgehammer as they hit their safety bar these repeated blows

11:16deform and weaken the safety bars were still some of them on lock the weight is enough to bend the lap bars

11:23out of place providing enough room for a passenger to fall from the car we actually find in one of the

11:29cars that the bar has been so far forwards it's almost completely open on the jet line's third descent

11:36a passenger in car number five is ejected from his seat plunging some 15 meters before hitting the ground

11:46with multiple fractures and extensive internal injuries tragically he dies

11:54as the train continues to collide with track joints two more passengers both in the rear carriage are thrown

12:00from the right one of the riders falls to the ground suffering fractures to his face arms and legs the other

12:13rider ejected from his seat lands on a beam and climbs onto the track miraculously he suffers only minor injuries

12:21the remaining riders are not spared all suffer internal injuries due to the compression of the safety bars

12:32considering the vital nature of safety bars and restraints on roller coasters the failure of jet

12:38lines lap bars to keep all passengers firmly locked in place while on the roller coasters was monumental

12:44forever associated with this accident the jet line closes permanently the grown-up lung tragedy highlighted

12:54the vital need for theme parks to pay closer attention to all renovation and maintenance work

12:59carried out on their rides had these retaining arms been manufactured to the original specifications

13:06the accident would most likely never have happened all it took was a simple flaw to set off a chain

13:11reaction that led the riders into a sequence of events that no safety procedure had foreseen there is

13:18an inherent amount of risk deciding to go on a roller coaster and in many ways that's part of the fun

13:23nobody should ever die because of that decision

13:29the jetline was a relatively modern ride with a number of automated mechanical safety measures installed

13:36but in 1972 any safety measures were much more rudimentary and a ride at a theme park in london still holds the

13:45record today for the worst roller coaster disaster in history

13:50world war ii

14:03opened in 1951 as part of the festival of britain the battersea park funfair operated for over 20 years

14:11designed to lift british spirits after the chaos of world war ii

14:15and one of the great star attractions was the big dipper

14:28modeled after the american roller coasters that were making waves across the atlantic it was the largest

14:33roller coaster in england it's a classic coaster with eight slopes and a 1.2 kilometer track

14:40one of the longest for its time it's a wooden coaster so you get a sort of giant kind of

14:48structure swirling structure with lots of wooden beams and on there there's this rail track and on

14:54sat on top of the rail track you've got three cars and each car can take five rows of two people so

15:01that's 30 people in total on this car no chance of going off the rails here it's a 55 miles an hour

15:06journey with your heart in your mouth and your stomach trying to catch up a brakeman is positioned

15:12between the first and second car their task is to control a braking lever to ensure the train

15:18doesn't exceed speed limits and guarantees a controlled stop at the end of the ride

15:24the brake man is like the driver of a train but he's only got one thing he can do which is apply a

15:30little bit of brake pressure on there so if anything happens that's the only mechanism he has to do

15:37anything about the ride the big dipper is a safe attraction and a benchmark of its kind symbolizing

15:44the rebirth of an england looking toward the future the rider got an excellent track record it'd been

15:50running for just over 20 years as a long-standing source of fun and enjoyment tourists flocking into the

15:56battersea fun fair could not have suspected that the park's greatest attraction would one day turn

16:03into one of the most deadly accidents in the history of roller coasters

16:12tuesday may 30 1972 it's 2 p.m school has just ended and children from all over london are flocking to

16:21battersea to enjoy some time away from their studies their destination the big dipper where

16:27the queue stretches endlessly passengers climb aboard one of the big dipper's three carriages

16:34what they don't know is that it will end in tragedy

16:40so we've got 30 people packed on this ride on this particular fateful day they're getting towards

16:46the top of the ride where it's just going to tip over and you expect it to go hurtling the other way

16:52but for the first time since the big dipper's creation the scene takes a completely different turn

16:59as the train has pulled up the first incline ready to begin its ride it suddenly starts rolling backwards

17:05down the track they think it's the guy's operation the rider having a bit of a laugh with them

17:12mixing it up a bit making it exciting the brake man is going to put the brake on then they continue

17:17again and so this sense in the car everybody's super excited this is something new but it's only after

17:23a few seconds as they continue to pick up speed going backwards that people realize this is not

17:30supposed to be happening in reality the cable pulling the train upward has just snapped

17:37these three carriages and 30 riders are at the mercy of gravity they gain speed over a 27 meter drop

17:47out of control and rolling in reverse the train hurtles past the station before hitting a sharp corner

17:53and separating from the track some passengers are thrown from their seats others are squashed in the

18:01collision that follows it was an absolute engineering catastrophe

18:10five children lose their lives in the accident and 13 others are seriously injured

18:16most of the people at the back all got crushed up man because they had come down backwards

18:23why did the big dipper fail what lessons have we learned from this tragedy

18:30to understand the reasons behind the big dipper accident we need to look at its construction

18:39like all roller coasters this ride features a number of ramps and inclines

18:44modern roller coasters often use strong chains to lift passenger trains to the top of the first ramp

18:51but on the big dipper the system is more rudimentary it's incredible to think about the technology

18:57they're using here they're using a rope to haul the carriage containing 30 passengers all the way up to

19:04the top the rope is connected to a winch and when that winch is wound it drags the cars to the top of the climb

19:12to a point where gravity will do the rest as the train makes its way around the ride

19:19if this rope snaps or fails the train would be unable to continue the ascent

19:24and be at risk of rolling backwards down the incline

19:28unfortunately this would be only the first issue the big dipper would face on tuesday may 30 1972

19:35it's 2 p.m after waiting in line for a long time 30 people some adults and the majority of children

19:46take their seats in the three carriages around the brake operator

19:50the ride begins as expected with the passengers experiencing the rattle of the carriage and the

19:56groan of the wood as they climb up the first of the ride's eight peaks 2.01 pm as the first carriage

20:04reaches the top disaster strikes in front of the train the rope suddenly snaps

20:12and then this whole set of carriages start to roll backwards

20:15down below the people in the queue suspect nothing thinking the brakeman is playing a trick

20:26but as the train begins to speed backward down the track they quickly realize things are not normal

20:34but there's still hope an anti-rollback braking system had been fitted to the big dipper in case of such

20:41an emergency this anti-rollback braking system also known as dogs is essentially the train's lifeline

20:49in case the rope snaps located beneath the cars and along the initial lift hill it locks the train

20:58in place and prevents it from rolling backward on the big dipper this was pioneering technology

21:05they're little hooks on the ride or spigots and there's this sprung bar which rolls over them

21:11on the bottom of the carriage and every time it goes over one it locks in it's precisely in these

21:16braking systems that the next disaster strikes originally eight brakes were supposed to be installed

21:24on the big dipper unfortunately when the rope breaks only half of them are in place to hold the weight

21:30of the train not only were there only four in existence when there should have been eight

21:37only one of them was shown to be operational just one dog brake trying to stop a train that heavy

21:45disaster is inevitable the only operational brake fails unable to stop the weight of the fully loaded

21:53train with nothing left to stop it the train picks up speed and rolls backward down the track toward

22:00the loading platform and the crowded queue but all is not lost because we have a brake man who's

22:07sitting between the first and the second carriage he can apply his brakes some writers may think it's

22:14just a joke at first but the brakeman is the first to realize the horror of the situation he is the last

22:21line of defense against the catastrophe unfolding before his eyes

22:25on a normal day the brake man will be breaking going into the corners but on this particular day when

22:34the ride starts heading backwards he has a job on his hands this is completely new territory to him

22:42the big dipper's brakeman pulls his lever in a desperate attempt to stop the three packed cars

22:47but despite his best efforts it's not enough to prevent the worst case scenario it gathers too much

22:55momentum as it reverses downhill speeding into a sharp corner the train rolls back through the station and

23:03enters what should be the last corner of the ride and it enters it at far too higher speed

23:09202 pm the last car speeds into the curve it derails and slams into the safety barriers dumb passengers

23:18are projected from their seats over the hoardings and down onto the ground others are crushed in the

23:24wreckage as the train folds upon itself one car at a time the second car crashes into the first

23:32shattering the wooden structure and causing fatal injuries to the young riders

23:38the wooden supports of the track are stained with blood people from the queue rush forward to help the

23:44victims you'd think that this was the end of the catastrophes that could happen but there's one final

23:51thing that's going to come and bite everybody there one final incident the lead car remains on the ramp

23:58about 15 meters above the ground although the other cars have taken the brunt of the damage

24:04this car is relatively intact and its riders are safe at least that's what they think

24:15tuesday may 30 1972 the big dipper although the other cars have taken the brunt of the damage

24:24the lead car remains on the ramp and its riders are safe at least that's what they think it's not

24:33just the rope and the brakes that were faulty on the big dipper the truth is that the ride is in

24:39terrible condition two years earlier in 1970 part of the big dipper's track and wooden fences had been

24:48destroyed in a fire as replacements the roller coaster's management decided to use salvaged materials

24:55from an older ride but these wooden parts were over 50 years old and in poor condition and the hoardings

25:03are an important part of the track because they would provide almost a safety barrier containing the ride

25:10within itself as passengers climb from the wreckage on the train of may 30th 1972 they wrongly presume

25:18the safety rails and hoardings which surround the track are strong enough to hold their weight

25:25these decayed supports would lead to yet another death in this terrifying accident

25:30one girl only 14 years old climbs free of the wreckage and attempts to help her friends she leans on

25:40the railings at the side of the walkway however the hoardings weren't strong enough to hold her weight

25:46but it gives way she falls 15 meters before hitting the ground her death was the final tragedy of the big

25:57dipper disaster in total three people die at the scene two others were rushed to the hospital but later

26:04succumbed to their injuries all were between 8 and 15 years of age 13 more were injured some left

26:16permanently disabled this accident shattered the lives of the survivors many of whom would live

26:23with post-traumatic stress and survivors guilt for decades the disaster exposed a series of oversights

26:31that proved fatal shaking public confidence in amusement park safety for years to come

26:39beyond the 66 structural defects the owners and operators of the big dipper were accused of hiring

26:46untrained staff mainly teenagers who lacked the knowledge to operate the ride safely

26:51it was also alleged that the battersea fun fair staff were intoxicated while on duty despite this

26:58the chief engineer and the manager of the big dipper were acquitted in 1973. on the big dipper the failure

27:06of a mechanical hauling rope led to a runaway train and the tragic loss of five lives but just because a

27:14ride doesn't have a track doesn't mean it's guaranteed to be safe even flowing water can lead to tragedy in the

27:21wrong circumstances as we see on the thunder river rapids ride in queensland australia

27:41if you're a roller coaster enthusiast and you're there with your friends and family

27:45you're going to visit dream world covering an area of one square kilometer the equivalent of 143 soccer

27:52fields it is australia's largest theme park dream at dream world it's the biggest entertainment complex

28:02in the southern hemisphere and the best value anywhere there are thrilling opened in 1981 dream world

28:09it features 47 attractions including an imac cinema a zoo and six roller coasters one of the most iconic

28:18and popular attractions is the thunder river rapids

28:24it's a four minute ride that courses its way through various rapids and white water culminating

28:31in a conveyor belt that lifts the raft back to the top of the ride where passengers can unload before new

28:38passengers reload and head off on their journey originally classified as a medium thrill attraction

28:45the thunder river rapids is open to all riders over 1.2 meters tall with speeds reaching up to 45 kilometers

28:53per hour each raft spins on itself as it travels along the 450 meter man-made river

29:00it's relatively slow compared to other rides but slow doesn't necessarily mean safe and this is

29:08when fatal engineering features can start to show themselves

29:152 pm four adults and two children a 10 year old boy and a 12 year old girl take their seats in raft number

29:22five after completing the ride without any issues the riders are calmly ascending the conveyor belt still

29:31seated in their raft they have 42 seconds of carefree ascent unaware that their time is running out due to an

29:38unexpected obstacle up ahead at the top of the conveyor belt an empty raft raft six has become

29:45stuck between the conveyor belt and the tracks which support the rafts as they pass through the unloading and loading bays

29:53there is no alternative path for raft five it's destined for impact

29:58the two rafts collide raft five is lifted vertically the six riders are left dangling above the moving

30:06conveyor belt but not for long two adult passengers fall from their seats with the velcro restraint belts

30:15doing nowhere near the job that they're supposed to they fall down through the conveyor belt and into the

30:22water below two additional passengers pummeled by the conveyor belt are pulled from their seats and into

30:28the mechanisms which drive the conveyor belt and the two poor children who are now suspended in the only

30:34two seats which survive they see all this unfolding below them all four adults perish in the accident

30:44the park immediately closes its doors how did a family friendly ride turn into such a tragedy could this

30:51disaster have been prevented the thunder river rapids two rafts collide two adult passengers fall from their

31:02seats two additional passengers are pulled from their seats and into the mechanisms which drive the conveyor belt

31:11all four adults perish in the accident a well-known problem with the ride concerned two large water pumps

31:21that would draw water back to the top of the ride providing the current to send rafts on their way as the journey

31:30begun and providing some of the white water and fast moving water as the masts made their way through the channels

31:37sitting three meters from the base of the river with a diameter of 1.6 meters they pump up to 4 000 liters per second

31:50they're positioned at the highest point of the attraction just before the landing zone

31:56the issue is that if one pump stops working correctly or switches off entirely the water

32:02level throughout the ride would lower dramatically and incredibly quickly and what you thought was a

32:09safe environment to leave in by the time you get back and it's a pretty dangerous environment that you're

32:14going to arrive back into however this was beginning to happen quite regularly the water could sometimes

32:21drop 15 centimeters in just 20 seconds and 40 centimeters in less than a minute on the day before the

32:29incident continually experienced an electrical fault which meant that the pump kept tripping it kept

32:34cutting out on the day of the accident the system broke down twice an electrician was supposed to arrive

32:42on thursday october 27 but that would be too late two days earlier the thunder river rapids earned its

32:49place among the deadliest attractions ever built you probably think that one of the previous engineering

32:55failures the loss of water coming out of the pump would trigger the whole ride to be shut down but

33:02this ride is different there is a significant flaw in this system there's no formal marking to determine

33:08the correct operating levels of water within the ride and no automated system to monitor water levels

33:15or to raise alarms when they drop below a safe operating level instead operators depended on waterline

33:23marks on the walls of the loading and unloading zone left behind by years of continuous use

33:29despite recommendations to install automatic monitoring systems to detect a drop in water

33:34level below a critical threshold the attraction continues to operate based solely on unreliable visual checks

33:432 pm tuesday october 25 2016 families gather in the boarding area awaiting the arrival of a raft to enjoy the

33:51thrills of thunder river rapids as raw five pulls in six individuals climb inside two young children are

33:59accompanied by two women and two men as they begin their tour of thunder river rapids they have no idea

34:06that in less than five minutes four of them will be fighting for their lives two hours earlier one of the

34:13pumps suffers a power cut yet again the water levels at the loading and unloading bay have dropped beneath

34:20where they're supposed to be it's 202 pm as raft five and its six riders begin their journey through the

34:28thunder river rapids the water level has dropped by 30 centimeters at the ride's starting point

34:36now a new element comes into play a mechanism beneath the rafts meant to ensure rider safety

34:44is supposed to allow them to disembark even when water levels are low underneath it there's a metal

34:50structure which stops them sinking too far they're supposed to be super safe but they are going to be

34:56the cause of a fatal engineering catastrophe these steel frames 1.25 meters wide are supported by cross beams

35:04spaced 1.27 meters apart they are supposed to remain underwater due to the failure of one of the pumps and the drop in

35:13water level these frames are almost fully out of the water

35:23on the thunder river rapids the top of the water pumps are lower than the steel railings

35:32it's 2.03 pm it takes just one minute for the steel frames which are usually submerged under 30 centimeters

35:41of water to now sit 10 centimeters above the water

35:47raft 6 positioned in front of raft 5 reaches the unloading platform for its riders to disembark

35:55but instead of floating and continuing its course once empty

35:59it does something unusual raft number six is stuck at the top of the conveyor belt

36:06it's stranded upon the metal creating an incredibly dangerous obstacle the same time raft number five

36:14has completed its journey around the rapids and is now making its way up the conveyor belt getting

36:20closer and closer to rock number six a collision is inevitable but there are more issues with the

36:26conveyor belt itself that turns the collision into a catastrophe

36:35the thunder river rapids conveyor is essentially a mechanical belt driven by a chain much like many

36:42others it consists of wooden flats fixed at regular intervals on this day in october 2016 the conveyor was no

36:52longer in the same condition as when it was originally designed during the early years of the thunder river rapids

36:59ride the motors driving the conveyor belt kept tripping out because the conveyor belt was too heavy

37:06to address weight issues the initial solution was to remove one out of every three wooden slats

37:12but when the conveyor was still deemed to be too heavy park engineers decided to remove a total of

37:17two out of two out of every three slats and it worked with one every three slats there was still enough

37:25friction to grip the rafts and pull them to the top and the motors stopped tripping out it was a successful

37:33engineering modification or so they thought

37:37204 pm the final minute before the thunder river rapids ride and dream world plunge into horror due to

37:49the drop in water level caused by the failure of one of the two pumps raft six is immobilized on the

37:55steel frames of the passenger unloading dock for 53 seconds raft five approaches from behind with its

38:03six passengers still on board they could probably see that raft number six is stuck at the top but

38:10they don't think it's going to be an issue maybe they'll bump it but a very different scenario is about

38:16to unfold it's 2.05 pm in fact they do get there and they bump it several times

38:26but what they don't realize is that these big holes in the conveyor belt every time it bumps it's trying

38:33to get wedged into these big abysses and finally the last one it does get caught the gap in the

38:39wooden slats on the conveyor belt is large enough for the flotation collar of raft five to slip into

38:45with the wood now acting like teeth which bite down and drag raft five into a vertical position

38:54a ride operator fails to hit the main emergency stop

38:58a fatal mistake another operator triggers an alternate stop it takes eight seconds to stop the

39:05conveyor by this point it's too late the damage has already been done now completely vertical raft five

39:13is at the mercy of the conveyor mechanism at this moment yet another failure seals the fate of the riders

39:20two passengers fall from the raft their velcro straps unable to hold their weight as they fall between

39:30the wooden slats of the conveyor belt and into the waters below the conveyor belt now pummeling those

39:37left inside the raft two more adult passengers lose their life as they get trapped in the conveyor belt

39:45mechanisms two seats which had been pulled lowest by the conveyor belt are totally destroyed they

39:51couldn't escape in time and imagine this whole thing is evolving over several seconds it's not like

39:57an instantaneous disaster this is a slow disaster which is unfolding horrifically in front of these two

40:04children the four adults are pronounced dead at the scene the investigation reveals critical safety

40:17failures in the ride's operation and insufficient staff training i'm a mother i have a family i take my

40:25family to dream world this could have been my family and i'm completely sympathetic to what they must be

40:30going through and i hope that i will be able to help them and if i can't help them personally we will

40:35make sure that we have everything in place to assist them through this tragedy

40:41dream world was fined 3.6 million australian dollars and paid over 7 million australian dollars to

40:47victims families the thunder river rapid was actually made by the park themselves so they would have come

40:56up with a whole scheme for maintenance and how this thing should be looked after repaired inspected every

41:03day and they're the ones who are writing the rule book for this thing but when you start to cut corners

41:08you're entering into a world of unknown fatal engineering causes the thunder river rapids ride will never reopen

41:18a memorial is erected in place of the ride honoring the four lives lost

41:26these three examples of fatal engineering

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