That’s How You Can Survive A Grenade Blast
Youtubers Mark Rober and TheBackyardScientist explored the science behind exploding grenade and explains how to be safe from it. Just to be clear this is just for explaining the logic and education, please do not go around and test the theory with the live grenade! We love you too much.
A grenade has a waffle shaped body, which provides stress concentration points making it easier to break off and disperse when the explosives inside the grenade kick in. These waffle blocks then shoot off in all directions, meaning 40 of them on a standard grenade are 40 potential bullets, making the grenade so deadly.
We all know that a bullet shot inside a water body simply refuses to move more than a few feet, as the fluid drag retards its speed and breaks the momentum. So, by this theory, it seems obvious that if you dive into a pool with a grenade in it, there is a lesser chance of the 40 bullets reaching you.
We know that air is compressible, and water is an incompressible liquid in comparison. So when a grenade, or any explosive bursts in open air, the air around it compresses and takes a lot of energy out of the shockwave, limiting the effect of the shock wave to mere feets. But that will not be the case in a water body, as the incompressible liquid will transfer the energy without much change. This means that when the shockwave reaches a person inside the water, it will exert fatal pressure on the air inside the body, such as in ears, sinuses and the lungs, possibly bursting them and leading to instant death.
Youtubers suggest, the best bet it to run off at least 15 feet away from the grenade, and lie down on the floor with feet facing the explosive. This way you have 1% chance of the flying bullets to hit you, while no major effects of shockwaves threatening you.