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The c4 is what initiates the "boom". A typical hole for cratering after you use one of those shaped charges will hold two of those cratering charges. you dual prime the system by putting 1ea C4 on each. if one cratering charge, then dual prime with 2ea C4.

place the c4 inside the dotted lines.

edit to add: naturally the depth of the bore hole created by the shaped charge depends on the ground/surface material.

The M180 cratering charge has a 15lb shaped charge and a rocket propelled cratering charge set up so that when cooked off, the rocket follows the slug from the cratering charge into the ground and detonates.. Creates a crater in one step vs the two-step process of blowing the bore holes and then coming back and putting in the cratering charges. The good thing about these is that the crater from the M180 will be asymetrical and still form an effective anti-tank obstacle since it's mouted on a tripod configuration and the munitions go in the ground at a an agle (<45degrees?)

It's beein a while since I was in an engineer unit and dealing with any of this stuff.