Why did submarines sometimes suffer from depth charges even when the bomb exploded away from the boat?

When any bomb explodes, a very large amount of gases is immediately released. When a depth charge explodes, a large amount of gases are formed, which from the point of explosion transmit an explosive impulse in all directions. Since liquids are practically incompressible, the blast wave travels over long distances in water without greatly attenuating it. Therefore, even if the bomb detonated on the side, a strong blast wave was guaranteed to reach the submarine.

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