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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! ๐Ÿ˜€ 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.

100 thoughts on “How to Survive a Grenade Blast

  1. Dive on pool decl vs jump in pool
    Maynn ill just run inside ๐Ÿคฆ๐Ÿปโ€โ™‚๏ธ๐Ÿ’๐Ÿปโ€โ™‚๏ธ๐Ÿ˜‚

  2. But your 15 feet away from the grenade(in water) wont the blast wave weaken in the test you showed what happens if your really close to it

  3. Why donโ€™t you just stand legs deep in a pool if your grenade falls into your pool (not very likely that you would have a grenade) but why not ?

  4. Hello dude perfect I'm Karena en I'm really sick I have a bad cough can my wish is to see you in England at Baywood Huron road house number 8

  5. Hi Mark! Have you seen Money Heist?

    #spoileralert Does this mean that Bogotรก in Season 2 should not have survived the blast from the C-4 in the Bank of Spain? ๐Ÿค“

  6. Minecraft:me:oh no tnt jumps to water haha u cant get me now

    Real life:me: oh no grenate jumps to water u cant get me now dies

  7. sorry but science experiment is a dud if you are not using legit grenades.. compare all you want based upon pressure that is created within water but a pool is used as an example…โ€ฆ its like saying why does me ears hurt in a 12 ft pool but they don't when I dive in the ocean.. sorry but your science experiment is flawed but most people wont think of that.. you forgot pressure based on volume of water. your variables are not consistent.. basically what you are saying might be true in a pool but not the ocean!!! your welcome for the real science

  8. Do you know whatโ€™s worse

    I watched this video more than once and I always chose the pool. So if this situation was real…

    Goodbye world

  9. ik im late but from what i gathered if there is a grenade going off in the water, if you jump out but the area below ur waist (legs) are still in, you would be fine?

  10. So what if your top half is above the water and your bottom half is under water with the grenade ๐Ÿคฃ๐Ÿคฃ๐Ÿคฃ

  11. As my opinion
    Water have more chance to survive because the water pressure will block and crush the gunpower and make the explosion weaker

  12. ๐Ÿ“ฒ*00212645752301* *whatapps*๐Ÿ“ฒ
    ูˆุฌู€ู€ุฏุช๐Ÿ’โ€โ™‚๏ธ ูƒู€ู€ุซู€ู€ูŠู€ู€ุฑ ู…ู€ู† ุงู„ู€ุชู€ุนู€ุงู„ู€ูŠู€ู‚ ุนู€ู† ุชู€ู€ูƒู€ู€ุจู€ู€ูŠู€ู€ุฑ ุงู„ู€ู‚ู€ุถู€ูŠู€ุจ ูˆุถู€ู€ุนู€ู€ู ุงู„ุงู†ู€ุชู€ุตู€ุงุจ ูˆุณู€ู€ุฑุนู€ู€ุฉ ุงู„ู€ู€ู‚ู€ู€ุฐู
    ูˆุฃุจู€ุบู€ู‰ ุฃุจู€ู€ุดู€ู€ุฑูƒู€ู€ู…๐Ÿ˜‰ ุฃู†ู€ู€ูŠ ุญู€ุตู€ู„ู€ุช ุนู€ู„ู€ู‰ ู…ู€ุนู€ู„ู€ูˆู…ู€ุงุช ูƒู€ู€ุซู€ู€ูŠู€ู€ุฑ ู…ู€ูู€ูŠู€ุฏุฉโœ… ู‡ู€ู€ุชู€ู€ู†ู€ู€ูู€ู€ุนู€ู€ูƒู€ู€ู… ูƒู€ุซู€ูŠู€ุฑ ูˆู…ู€ู€ุฌู€ู€ุฑุจู€ู€ู‡ู€ู€ุง ุดู€ู€ุฎู€ู€ุตู€ู€ูŠู€ู€ุง ูˆู†ู€ู€ูู€ู€ุนู€ู€ุชู€ู€ู†ู€ู€ูŠ๐Ÿคฉ๐Ÿฅณ
    ุชู€ู€ูˆุงุตู€ู€ู„ ู…ู€ุนู€ูŠ๐Ÿ™‹โ€โ™‚๏ธ ูˆุฃู†ู€ู€ุง ุจู€ู€ุดู€ู€ุฑุญ ู„ู€ูƒ ุณู€ุฑ ุงู„ู€ู€ูˆุตู€ู€ูู€ู€ุฉ ุงู„ู€ูˆุงุชู€ุณู€ุงุจ *00212645752301*๐Ÿ“ฒ

  13. 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.

  14. 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…

  15. The real answer is not even in the video…

    The real answer is…
    Awareness, just donโ€™t drop it, or if you didnโ€™t do it, throw it back to your friend that you hate so much

  16. 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?

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