The trick with putting a body in a foundation hole, is you actually dig a shallow hole in the bottom of trench to be filled and cover it over with dirt, so the body is actually under the foundation. Then when it rots down it doesn't create a void, and the concrete slab over it stops it being discovered.
Plus, the construction crew isn't going to notice this body in their trench.
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The trick with putting a body in a foundation hole, is you actually dig a shallow hole in the bottom of trench to be filled and cover it over with dirt, so the body is actually under the foundation. Then when it rots down it doesn't create a void, and the concrete slab over it stops it being discovered.
Plus, the construction crew isn't going to notice this body in their trench.