When a gun is fired underwater, the bullet transfers energy into the dense water almost instantly. Because water resists compression, a powerful pressure wave spreads outward. The rapid drop in pressure behind the bullet causes cavitation, where water briefly vaporizes into bubbles. These bubbles collapse violently, creating swirling, tornado like cavities and shock patterns. The visible bubble trail is not air from the gun, but vapor pockets formed by extreme pressure changes and fluid instability around the fast moving projectile. Want more interesting content like this ? Follow gravitonomy :) Via : Unknown No copyright infringement intended. Kindly DM for Credit/Removal/Collaboration :) #gun #velocity #gunshot #science #physics