Hundreds of times we had to see in the movies how the hero of the action movie jumps into the water to escape from the shots of firearms. Even if we forget about the immortality of the main characters in the cinema, we must not forget how gracefully and slowly the lead kids glide in the water. How much is seen on the screen similar to what would happen in reality.
Army divers use special weapons with special cartridges for firing underwater for a reason. Therefore, it is safe to say that most films showing how heroes escape from shots in the water are not so far from the truth (although some degree of artistic exaggeration is still there is). Once in the water, the bullet encounters much more resistance than when moving in the air. This is because the density of H2O is almost 800 times higher than the density of air. As a result, most rifle ammunition will move about 1-1.5 meters in water at a speed and force sufficient to hit a person.
Interesting fact: in accordance with the hydrodynamic equation of resistance, we know that the faster the bullet moved when it hit the water, the faster it will lose its speed.
It is also worth paying attention to such seemingly unremarkable subtlety when firing at water, as the angle of fire. Most people (under normal conditions) cannot fly over water, and therefore the angle of fire is unlikely to be 90 degrees. Therefore, even at an angle of fire of 30 degrees, even the most powerful ammunition is not able to pass more than 1.5 meters under water. Moreover, if the angle of fire is less than 30 degrees, then the probability of a bullet ricochet on the water begins to seriously increase.
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No less interesting is the fact that many ammunition, when hitting water, simply collapses, turning into a heap of fragments. First of all, this applies to bullets that move at a very high speed. At one time, a similar experience was carried out on the TV show "Mythbusters". The team found that if a bullet exploded on water, a 10-centimeter depth could also save.
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And the last thing to remember. When hitting the water, even at a relatively low speed, any bullet changes its trajectory. This makes firing a person under water extremely ineffective and incredibly difficult.
Do you want to know even more interesting things? How about reading about automatic hybrids and needle cartridgesto find out what the frogmen are armed with.
A source: https://novate.ru/blogs/021119/52261/