In Greyhound (2020), Commander Ernie says to Mister Lopez about firing U-Boat:

Commander Ernie: Mister Lopez, prepare to engage that target. When he dives, we're gonna hammer him with two patterns Shallow, then deep.

What does "two patterns Shallow" mean?


The commander of the ship was ordering depth charges to be deployed. Depth charges are not precision weapons one can aim at a target. Instead, they are launched in an area where a target is suspected. So, launching multiple in a spread pattern greatly increases the chances of a hit.

The detonation fuses on a depth charge work by measuring e static pressure of the water around it. The lower it goes in depth, the higher the pressure around it. The fuses are adjustable on the surface to detonate at a depth preselected before their deployment.

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