How to Survive a Grenade Blast

So I’m here today in Florida filming with Kevin more commonly known as TheBackyardScientist. That’s right! And today we’re going to take these two live grenades, and we’re going to be dipping them in this tub of liquid nitrogen. So go ahead and hand them to me. And then- DUDE! BABY ALLIGATOR! 😀 oh no. So now we’re both about 15 feet away (4.5m) except I’m on land with a grenade on land, and Kevin is in the water, with a grenade in the water. So the question is, which one of us has a better chance of survival? Take a moment to decide, do you dive on the pool deck, or jump in the pool? We both had very different theories for survival. So as firm believers in the scientific method. We decided to test out our hypotheses. So we devised some experiments but before I get to those, I think it’s important to understand how a grenade actually works. So once you pull the pin, as long as you keep this handle pushed down You’re perfectly safe, but as soon as you let go of the grenade. This handle springs off. Which releases a spring loaded striker that hits a percussion cap that starts a 5 second fuse, that you can’t do anything to stop. (Oh great.) but I never really thought about it until I made this video but the reason you see a “waffle” pattern in grenades, is to create weak points in the shell. So that’s where it’s going to break first. And since there are 40 bumps, this grenade is basically an explosion that shoots 40 bullets in all directions. In warfare, that’s what makes them lethal. So the best strategy is to get as far as possible in a few seconds, and then hit the deck with your feet facing towards the grenade. This present the smallest possible target for a flying grenade chunk to hit. So 15 feet away (4.5m) mathematically that puts my chances of getting hit, at less than 1%. (YAY!) But things are even better for Kevin in the pool! It’s been documented that bullets do not travel far in water. At all. The drag force is so high, they just disintegrate after a few feet. So he has a 0% chance of getting injured by a grenade fragment, in the water. But we are thorougher men of science, and we wanted more information. So we designed an experiment, where we filled 3 balloons, half with water, and half with air, to roughly mimic the human body, which is mostly water. But we have pockets of air in our lungs, intestines, in our sinuses, in our ears. And then we subject them to identical explosions, identical distances apart in both air *BOOM!* and water. *Even more BOOM!* As you can see, there isn’t much effect on land because air is compressible. which helps dissipate energy, plus the blast wave reflects around objects. But in water, the story is different. (Woah.) Water is in-compressible. Which means not only is the blast wave not dissipated, but is passes right through your mostly water body. So the air in the balloons, represents the air in your body. Like your lungs, and your sinuses. So basically, what’s happening is the blast wave is pushing in on you, but the air cavities can’t push back with the same force, since they’re filled with compressible air. That means they move a lot, really quickly, which causes permanent damage. As a control, you can see this balloon that is filled with just water. It is perfectly fine. That would be like your arms and legs, which have no air in them, and they are basically in-compressible like water and would be fine. An explosion under water, is sort of like these silver ball things (Newton’s cradle…) So this represents the initial energy of the blast, which then comes down, and passes through the in-compressible water, and then comes out without loosing any energy at the water surface. but now you squish-able lungs are surrounded by in-compressible water, in the path of the blast wave. And so, when the blast happens, there’s a lot of relative motion. Which is bad, if you like your lungs, the way the are right now. (I don’t.) And sadly, our experiment is verified in real life. So the jerks, throw an M80 into the water, and you can see the devastating effect it has on land, if a bird were that close to an M80, it would be startled, but it would be perfectly fine. So now that you know, think back which did you choose? While it’s true, there is a small chance you would get unlucky with the grenade chunk, if you choose to dive next to me. If you choose to join Kevin, you will be in the pool, for the rest of your life. (Rekt.) (Rekt.) So huge thanks, to the TheBackyardScientist for dying, in the name of science! If you’ve never seen his stuff, you just have to check it out. Here’s a video, we just finished filming. It’s a bunch of Oobleck, which is a non-Newtonian fluid, and we destroyed it in every way imaginable. It’s incredible footage, his channel is full of this type of junk, so check it out. Subscribe. And as always… Thanks for watching. So I live, here, and I took a plane to Kevin’s pool, way over here. And on the plane ride, I was listening to the Harry Potter book series. And I know this is quite possibly the least cool and sophisticated audio book recommendation that I’ve ever given on my channel. But I read the books, 15 years ago, and it was really fun to rediscover like a bunch of the little details, that I’d forgotten Plus the dude who reads them, does all of the voices. And he does a really good job. So if you want something fun to do, while commuting, or work around the house. You can rediscover the Harry Potter book series, like me, or you can get any other book for free. All you do is use the link in the description, or go to By supporting Audible you support me, and future plane rides to places like Kevin’s pool. English subtitles by Iowyyn and corrected and made a little more funny by Icy Cubey. Now, go subscribe to Mark Rober.


  1. Yudi Soegiono

    October 19, 2019 at 1:31 pm

    Jump in the pool

  2. Sappskull 2.0

    October 19, 2019 at 2:56 pm

    Ur vid is a meme

  3. Ian Thompson

    October 19, 2019 at 9:54 pm

    I died

  4. Pavel Podešva

    October 19, 2019 at 11:48 pm

    Do you need a real grenade?

  5. Nordia Brown

    October 20, 2019 at 2:19 am

    Jump in.the pool

  6. Art Keyos

    October 20, 2019 at 2:27 am

    Love subtitles comments 😀

  7. King Mime

    October 20, 2019 at 3:43 am

    Uhhh…..why did u unrelease the grenade

  8. Pixels

    October 20, 2019 at 4:39 am

    Now when I see a floating fish at my lake I could say it blew up

  9. pookee johnson

    October 20, 2019 at 6:59 pm

    I think u jump in the pool

  10. Top10vlogz !!!

    October 20, 2019 at 7:41 pm


  11. erica presley

    October 20, 2019 at 8:51 pm

    Have you ever thrown a grenade? Like if you haven't and comment if you have. And if your family member was/in the army thank you.

  12. erica presley

    October 20, 2019 at 8:53 pm

    Oh and go to 1ced and click the first one and please subscribe.Thank you

  13. Running Production

    October 21, 2019 at 8:29 am

    Well, the "handle" is actually called spoon in the US Army, we are discouraged to call it "Handle" because we don't want people to handle the grenade with the "Handle" if you catch my drift.

    Grenade don't usually kill you with shrapnel, but it kill you with a shock wave, many movie would portrait people being stunned and shock after a grenade is thrown into an enclosed environment which basically the same as people repeatedly punching your brain, because there are no where else for the shock wave to goes but keep bouncing back, people usually died from brain swelling and internal bleeding even if they did not catch any shrapnel

    Outside, Grenade actually didn't do much, it's more like a throwable claymore, which is use to wound, but not kill your enemy. You chuck a grenade into an open Machinegun Nest, the occupant of that nest may be wounded but not necessarily killed (Depends on where the grenade landed)

    The only way to avoid being wounded by a grenade is to get lower than the grenade when it exploded, or put something in between you and the exploded grenade, in the Army we were taught to get down using the bergen to shield between you and the grenade, the Bergen will absorb most of the shockwave and shield you from shrapnel damage too, however, don't do what most TV do by putting your Flak or K-Pot on top of a grenade, it won't work, it will only get you a medal of honor posthumously…

  14. Jessica Halvorson

    October 22, 2019 at 1:13 am


  15. Pieter Boer

    October 22, 2019 at 3:56 pm

    1:54 y'all thinking the same as me?

  16. x Ludicrous x

    October 22, 2019 at 7:52 pm


  17. Eaulrich’s Vlogs

    October 23, 2019 at 11:31 am

    The real answer is not even in the video…

    The real answer is…
    Awareness, just don’t drop it, or if you didn’t do it, throw it back to your friend that you hate so much

  18. Skateboarder Pro

    October 23, 2019 at 6:25 pm

    Kevin whin,s

  19. noah AJ 66432

    October 24, 2019 at 12:06 am

    I would R U N Away from the grenade instead of jumping in water or diving on ground

  20. Totok Ocampo

    October 24, 2019 at 4:50 am

    Why not just run for ur life

  21. Emily Kelbell

    October 24, 2019 at 7:59 am

    Exactly!! That is the best thing you could ever do to the globe model and that's the best use of it!! (5:07)

  22. CASAN0VA

    October 24, 2019 at 1:59 pm

    YouTuber in YouTube with a YouTube on YouTube*

  23. Jette Møller Jensen

    October 24, 2019 at 5:45 pm

    The dude that reads them (the Harry Potter audiobooks), is Stephen Fry, might I add 😛

  24. Jeffrey D

    October 25, 2019 at 12:45 pm

    What if I'm drunk and my buddy and I take home two chicks and I'M THE ONE WHO HAS TO JUMPP ON THE GRENADE?
    How to survive that?

  25. Father_Xhungus

    October 25, 2019 at 9:53 pm

    Pool pool

  26. The Dude

    October 26, 2019 at 7:47 am

    on pool deck

  27. Kick Punch gaming

    October 26, 2019 at 12:40 pm

    1:53 wtf it could hit you balls

  28. Lolipop Dornit

    October 26, 2019 at 1:55 pm

    But if a fuse burns then wouldn’t the water stop it


    October 26, 2019 at 5:26 pm

    I bet the backyard scientist is a Minecraft pro

  30. Noor Nasri

    October 27, 2019 at 12:41 am

    So, wouldn't it be best to kick the grenade into the water and duck on land?

  31. Zaih Brigley

    October 27, 2019 at 2:14 am


  32. Wilton & Autumn Playz

    October 27, 2019 at 2:53 am

    Just go in the house

  33. Mr. PIP

    October 27, 2019 at 3:55 am

    Or.. just read something else that won't get u thinking witchcraft is cool

  34. AlexKazam

    October 27, 2019 at 12:29 pm

    In call of duty you can RE – throw the grenade by pressing G

  35. Yeet-ersarous. Rex

    October 27, 2019 at 5:09 pm

    Easy. Just use Flak Jacket

  36. Freddie Coate

    October 27, 2019 at 10:37 pm

    0:57. I was expecting him to say he tested it with his nephews

  37. Young Madara

    October 27, 2019 at 11:09 pm

    "Take a moment to decide."
    I would kick the other grenade to the water then crouch as low as I can on the ground. Thank you

  38. Nosson Oirich

    October 27, 2019 at 11:58 pm

    3:04 orange balloon looks like a human

  39. Skycle Playz

    October 28, 2019 at 12:38 am

    The silver ball thing is Newton’s crattle

  40. Sean Parkes

    October 28, 2019 at 2:07 am

    silver ball thing

  41. Sean Parkes

    October 28, 2019 at 2:09 am

    or u could just run

  42. mickle davees

    October 28, 2019 at 2:23 am

    0:17 that's a whole entire dog what u talking about

  43. slime 15140

    October 28, 2019 at 3:27 am

    Simple, if grenade in water, don't jump in. Otherwise dive for water.

  44. Sammy6apples

    October 28, 2019 at 4:24 am

    Mark: sliver ball things
    Me: actually knowing the name

  45. Law :3

    October 28, 2019 at 4:24 am

    The people that voted for water plays minecraft

  46. HolyPro 420

    October 28, 2019 at 7:40 am

    1:17 is literally a meme now

  47. snoןnǝɯǝɯ

    October 28, 2019 at 9:12 am

    Ryan bro just build a TNT launcher and get some diamond armor lol

  48. no u

    October 28, 2019 at 3:55 pm

    how about… kick the grenade into the pool…

  49. Jordan Fuel

    October 28, 2019 at 4:57 pm

    In short water is dense than air, so water will densly f**k you

  50. scorpius malfoy

    October 28, 2019 at 5:31 pm

    4:05 wait what happened?

  51. animation kayla ;-;

    October 28, 2019 at 7:29 pm

    I'd jump onto the ground 1 it would be easier to get away faster and is way more closer than water now if your on a cliff jumping off it's just like comcreate hard that's why when people jump over water they still where a pair sale cause how far it is and with the ground your chances of getting hit is most likely more but at least your still safe and not being compressed in the water (I haven't watch the while thing year I'm 1:57)

  52. Landon Shah

    October 28, 2019 at 7:41 pm

    What about if you exhale in the water

  53. 10k subs with one video?

    October 28, 2019 at 9:57 pm

    Sub to me if you love ur mum / dad / girl friend / boyfriend
    ( I’m a small youtuber trying to grow ) god bless you .

  54. Alan Cogan

    October 28, 2019 at 11:23 pm

    Just stuff the grenade up your arse, pull the pin, and have a 100% guaranteed chance of fatality.💥☠😆

  55. Shuckle

    October 29, 2019 at 1:18 am

    1:51 a grenade hits that inappropriate spot right there

  56. alex walker

    October 29, 2019 at 1:44 am

    i am going with mark i mean it is his show

  57. Aaron Soto

    October 29, 2019 at 4:58 am

    I would of said the pool. Good to know!

  58. A Singh

    October 29, 2019 at 8:43 am

    1:53 may be we need to close our feet too coz I like my nuts not getting hammered by a fragment.

  59. jalink1

    October 29, 2019 at 11:23 am

    this handle springsss..(video ends)

  60. Mr. Nice Kid

    October 29, 2019 at 12:06 pm

    It’s pool

  61. Nancy Salhab

    October 29, 2019 at 12:25 pm


  62. Rahul Plays

    October 29, 2019 at 12:29 pm

    Why would you photoshop your self to look buff and strong in the thumbnail xD

  63. Carrot Guy

    October 29, 2019 at 5:17 pm

    -but as soon as you let go of the grenade it will explode into a million pieces

    lets go

    Oh…. Well it was nice kno-


  64. sinde_tf nrg

    October 29, 2019 at 5:54 pm

    The one in the pool Will probably die because the pressure is som high

  65. uranium 3312

    October 29, 2019 at 8:13 pm

    Try this with a real grenade next time 😂

  66. Rocketiermaster

    October 30, 2019 at 12:26 am

    Solution: Drop the other one into the pool too, and stay on land

  67. Hype Beast

    October 30, 2019 at 4:51 am

    Does anyone hear the static to

  68. Marnys_plays

    October 30, 2019 at 1:26 pm

    OMG you took a Norwegian show Clio thanks for the Clio man

  69. Evan Matthews

    October 30, 2019 at 2:07 pm

    1:51 *goes between feet*

  70. Gary O

    October 30, 2019 at 2:12 pm

    Pool of course

  71. Nutella Cake

    October 30, 2019 at 2:30 pm

    I thought it said how to survive a grandma blast

  72. Minecraft Series

    October 30, 2019 at 2:35 pm


  73. Jags _11

    October 30, 2019 at 8:22 pm

    Jump in the pool

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