What was inside this tunnel, that killed 520 passengers?

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On the rainy night of March 2nd, 1944, the overnight steam-power freight train 8017 from Battipaglia to Potenza, did not pass through the railway station at Balvano in southern Italy.
The station master there was not overly worried.
But later at 5:10 that morning, when one of the crewmen from the freight train staggered into the railway station, the Station Master knew something was seriously wrong.

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Created by Daniel Turner
Script: Conan White
Chris Kane
Music Credit:


  1. Simple History

    Simple History

    Acum 14 Zile

    🕵️Wait wait, before you watch the video guess what was inside the tunnel?

    • Suraj Jha

      Suraj Jha

      Acum o Zi


    • jeric diaz

      jeric diaz

      Acum o Zi

      Morse code

    • Nadia Shah Qureshi

      Nadia Shah Qureshi

      Acum o Zi

      my grandfather running to school

    • حسنات Hasanat

      حسنات Hasanat

      Acum 2 Zile

      raid shadow legends

    • Jason M

      Jason M

      Acum 5 Zile

      Carbon monoxide

  2. Tapaswini DAS

    Tapaswini DAS

    Acum 15 ore

    Oh I Acctually guessed it!! They died from the carbon dioxide and since they had no windows or vents they all have died

  3. Jacob Wiles

    Jacob Wiles

    Acum o Zi

    Those poor Italians were so close to living in liberated Italy.

  4. Moynul Islam Neloi

    Moynul Islam Neloi

    Acum 2 Zile

    This gave me goosebumps!

  5. SAD GRIM???

    SAD GRIM???

    Acum 2 Zile

    Well now I know that my birth day is on the day 500 people died

  6. George Osborn

    George Osborn

    Acum 2 Zile

    Save yourself 8:30 minutes , it was carbon monoxide 🤦‍♂️

  7. Karsten Schoenberg

    Karsten Schoenberg

    Acum 2 Zile

    4:57 The worst gases are always odorless

  8. nujabeslistener


    Acum 3 Zile

    Chuck Norris?

  9. Stuart Hirsch

    Stuart Hirsch

    Acum 3 Zile

    Is that tunnel and railway still in use today?.

  10. iiThefoxteam23


    Acum 3 Zile

    Anyone know the music...?

  11. Marc Bondura

    Marc Bondura

    Acum 3 Zile

    This is not a mystery they were killed by carbon monoxide poisoning sitting there stopped that’s been established since it happened cmon now find something actually mysterious to lie to people about

  12. Ed Brook

    Ed Brook

    Acum 3 Zile

    pretty sure it was russia's greatest love machine

  13. Lhoy Jone Paradise

    Lhoy Jone Paradise

    Acum 4 Zile

    Oompa loompas

  14. Destiny Ninja123

    Destiny Ninja123

    Acum 4 Zile

    Basically the land version of Medan.

  15. Coen van Haaster

    Coen van Haaster

    Acum 4 Zile

    I was gonna guess either CO2 poisoning, or the rest of the mountain

  16. Antonio Baruel

    Antonio Baruel

    Acum 4 Zile

    they should have wear like masks

  17. unbekannt unbekant

    unbekannt unbekant

    Acum 4 Zile

    this wasn't a tunel this was paint spraid on a mounten to lock like one but if you try to drive trought you drive fullsped against the wall

  18. Lilibeth Caruso

    Lilibeth Caruso

    Acum 4 Zile

    soo sad im crying :((((((((((((((((((((

    • Lilibeth Caruso

      Lilibeth Caruso

      Acum 3 Zile

      and Im Italian

  19. clux


    Acum 5 Zile

    Plot twist it was just gta 5 players trying to stop the train

  20. Warren Bintoro

    Warren Bintoro

    Acum 5 Zile

    If a tunnel filled with enough carbon monoxide to kill 520 people. Imagine if it was worldwide. And it’s still happening

  21. mc4906


    Acum 5 Zile

    I wondering if this tunnel is still around today? That'd be a good spot for a paranormal investigation (as long as it's no longer in use)

  22. Juan Jackson

    Juan Jackson

    Acum 5 Zile

    Video starts at 1:27

  23. CANTEDSXGHT Gaming


    Acum 5 Zile

    100 less and this is a meme

  24. TmouseinthehouseYT


    Acum 5 Zile

    Simple History: 520 people died because of poisonous gas. My Little Brother trying to teach a class: Alright guys, so today we are going to be talking about how 520 people died because someone farts were deadly



    Acum 5 Zile

    In the tunnel is: impostor

  26. Damien Dark Star

    Damien Dark Star

    Acum 5 Zile

    Guess what was in the tunnel :) Barack obama

  27. Luis Murrell

    Luis Murrell

    Acum 5 Zile

    I wonder if this was the inspiration for that passage in Ayn Rand's Atlas Shrugged, where an old coal-burning train gets sent into a tunnel without proper ventilation.

  28. Malcolm McKane

    Malcolm McKane

    Acum 5 Zile

    I remember when simple history got to the video when it started

    • Jon Jon

      Jon Jon

      Acum 4 Zile

      Me too

  29. Robin Meehan

    Robin Meehan

    Acum 5 Zile

    Coyote Peterson: sees this video Also Coyote Peterson: *Y E S*

  30. El Chiviri

    El Chiviri

    Acum 5 Zile

    They should’ve sent a gas mask team or something.

  31. Rick Biddlecome

    Rick Biddlecome

    Acum 5 Zile

    I made my own helmet with a bucket. From mono lottablog

  32. Jaidan Brashier

    Jaidan Brashier

    Acum 5 Zile

    Oh... I thought might have been an object blocking the tracks, and the train collided with it at high speed, killing a bunch of people. Was not expecting that.

  33. Ex6tenze


    Acum 6 Zile

    Video starts at 1:23 .

  34. Hotel Papa

    Hotel Papa

    Acum 6 Zile

    what is the tunnel's name?

  35. Gnappopo2007


    Acum 6 Zile

    Something like this could happen in Thomas, but it would only take the narrator to say: "But luckily no one was hurt."

  36. 정문석


    Acum 6 Zile

    lucky no one was hurt :)

  37. Pasta Bowl

    Pasta Bowl

    Acum 6 Zile

    Wait, is this the Zanetti train?this sounds a little different you should cover that too

  38. Robert Sabo

    Robert Sabo

    Acum 6 Zile

    Waits insde the tanell to kill pasengers this is iposebly how

  39. Kovacic


    Acum 6 Zile

    Answer - Mothra/Muto

  40. ÆÙŒ *69

    ÆÙŒ *69

    Acum 6 Zile

    Uhhh Joe...

  41. Jake Antriasian

    Jake Antriasian

    Acum 7 Zile

    4:36 1 AM in the morning



    Acum 7 Zile

    *They caused confusion and delay*

  43. Device Technology

    Device Technology

    Acum 7 Zile

    I do not think that the 520 people died

  44. Sven is mad

    Sven is mad

    Acum 7 Zile

    Ghost: *It's free real estate*

  45. FBI Open up

    FBI Open up

    Acum 7 Zile

    GLADOS, turn on the air conditioning

  46. Liberty Prime 76

    Liberty Prime 76

    Acum 7 Zile


  47. FBI Open up

    FBI Open up

    Acum 7 Zile

    If only 100 less people were killed

  48. AnitaBonghit 69

    AnitaBonghit 69

    Acum 7 Zile

    Zero dark fifty?!

  49. California Critic

    California Critic

    Acum 7 Zile


  50. Peepee Poopoo

    Peepee Poopoo

    Acum 7 Zile

    Thanks for the red arrow pointing at the train tunnel don't think I would have seen it without the arrow💪

  51. Hitsuga Aorusaki

    Hitsuga Aorusaki

    Acum 7 Zile

    This feels like a creepypasta!!!! The music and setting my gosh

  52. chayes


    Acum 7 Zile

    Jesus loves u.

  53. Marcus Eaton

    Marcus Eaton

    Acum 7 Zile

    Lmao nice thats what they get for trying to get a free ride

  54. Poké Gear

    Poké Gear

    Acum 7 Zile

    Magellan tv

  55. Fredashay Klavierstein

    Fredashay Klavierstein

    Acum 7 Zile

    Video starts at 1:30

  56. Киска Блять

    Киска Блять

    Acum 7 Zile

    This was definitely one of the more dark and grisly simple history videos

  57. BA9000


    Acum 8 Zile

    My guess for what killed them is Captain Price

  58. TimesNewLogan


    Acum 8 Zile

    Knew it was gas. Could have been worse: steam engines were prone to "blowbacks" in tunnels, where if the dampers weren't set right when going through the tunnel, the pressure would be unable to escape through the funnel, resulting in it blowing back into the cab. The crew could die slowly and painfully, sometimes lasting for days in their own boiled skin.

  59. BobMuir100


    Acum 8 Zile

    Well it’s no surprise about the cause of death, once one ignores vampires etc smoke is the only possible culprit and I would say no one was to blame for the deaths: war is terrible and has consequences far and wide. Terribly sad for all concerned.

  60. Collateralcoffee


    Acum 8 Zile

    1:45 as an intro with ads?? Wow.... you suck.

  61. Chips Handon

    Chips Handon

    Acum 8 Zile

    The Fat Controller laughed. "You are dead."

  62. Dankman9


    Acum 8 Zile

    Interesting ending.

  63. Uberkist


    Acum 8 Zile

    Oh no, I didn't realize the danger of my home helium tank



    Acum 8 Zile

    0:51 infinite IKEA SCP-3008

  65. anti fa

    anti fa

    Acum 8 Zile

    Guessing the hyperloop

  66. Chris Kimball

    Chris Kimball

    Acum 8 Zile


  67. stan de MLG BOIEEEY

    stan de MLG BOIEEEY

    Acum 8 Zile

    Probably high way gogo

  68. OrangeAzzClown


    Acum 8 Zile

    7:45 - 8:28 ???

  69. Tiger Bond

    Tiger Bond

    Acum 8 Zile

    Agian in History where the MEDIA ! Gave the Public AN OPINION! Of what IS HAPPENING! HMMMM Media tells the truth?

  70. BelieveInMatter


    Acum 8 Zile

    What absolutely horrific way to die.

  71. Braden The e2 class

    Braden The e2 class

    Acum 8 Zile

    My great great great uncal was on that train😢😢😢

  72. My name is artu

    My name is artu

    Acum 8 Zile

    Are you sure it was carbón dioxide

  73. Dan Murphy

    Dan Murphy

    Acum 8 Zile

    carbon monoxide NEXT

  74. Lego tutorial and wotb replays

    Lego tutorial and wotb replays

    Acum 8 Zile

    Oh I know what u was advertising

  75. Alexander Jr. Sungkip Magtibay

    Alexander Jr. Sungkip Magtibay

    Acum 9 Zile

    It's carbon dioxide.

  76. Chimmy Tibula

    Chimmy Tibula

    Acum 9 Zile

    1am in the morning, huh? You gonna decapitate someone's head off, too?

  77. account for fun

    account for fun

    Acum 9 Zile

    5:25 lol that one passanger still eating his food

  78. Something Simple

    Something Simple

    Acum 9 Zile


  79. HayStarr


    Acum 9 Zile

    A train

  80. Kimberly Rae

    Kimberly Rae

    Acum 9 Zile

    A few miles in 15 minutes? That's pretty damn good for a man at night on a rail line by lamp light - that's Olympic marathon speed.

  81. Randy Surline

    Randy Surline

    Acum 9 Zile

    So sad

  82. houlay


    Acum 9 Zile


  83. SWAT Ape

    SWAT Ape

    Acum 9 Zile

    This is why we put more than 5 points into Endurance and Luck.

  84. del trotts

    del trotts

    Acum 9 Zile

    Go to 1min 23...........to cut the crap !

  85. Mrt Aeda

    Mrt Aeda

    Acum 9 Zile

    Horror is that, while some of the stupids killed themselves by reversing, forcing forward, overfilling the train etc... Some of them survived and got out of the tunnel and now are causing more disruptions in society.... Oh it really is scary to think what comes next in this horror story

  86. baraxor


    Acum 9 Zile

    Good recount of a wartime tragedy...but when I see the animated victims I keep wanting to yell YOU KILLED KENNY!! YOU BASTARDS!!

  87. David Dews

    David Dews

    Acum 9 Zile

    1:30 long self promotion intro🤦🏾‍♂️🤦🏾‍♂️🤦🏾‍♂️



    Acum 9 Zile

    great video

  89. Vinny213


    Acum 9 Zile

    Your mom

  90. GO_ Gondor

    GO_ Gondor

    Acum 9 Zile

    A thicc brick wall

  91. Androidmk


    Acum 9 Zile

    It was me I was hungry and wanted to eat their *ÇĄŔBØŃ*

  92. Spitfire Comics P.A Games

    Spitfire Comics P.A Games

    Acum 9 Zile

    520 dead bodys

  93. Jonathan Isbill

    Jonathan Isbill

    Acum 9 Zile

    Anyone else see the White star line flag

  94. cobra 727

    cobra 727

    Acum 9 Zile

    5:20 I am very confused by this image

  95. Wolf Studios

    Wolf Studios

    Acum 9 Zile


  96. Desperate Mohammedan the World's Strongest Arab

    Desperate Mohammedan the World's Strongest Arab

    Acum 9 Zile

    Spoiler: Godzilla did it.

  97. Waldemar Brauer

    Waldemar Brauer

    Acum 9 Zile

    82 seconds of introductory advertisement. What a fresh start.

  98. BluDeuce


    Acum 9 Zile

    does anyone know the music in the video?

  99. A'Murica


    Acum 9 Zile

    7:34 Im not surprised that no-one was given fault. It was the people who boarded the train without being told to really. The Engineers tried to get out of the tunnel but couldnt.

  100. Jonathan Williams

    Jonathan Williams

    Acum 9 Zile

    To be clear this was in the free part of Italy that had been liberated by the Allies after Italy switched sides