This image was taken during construction of the WTC. Notice that the Manhattan Shist (Bedrock) surface is exposed.
This image was captured during clean up in 2002. Note the indications and condition of the bedrock beneath where towers 1, building 6 and tower 2 stood.
This link leads to an interactive image comparison
This and the image above are graphics illustrating the condition of the sub basement levels of the structures contained in the east and west "bathtubs" of the WTC complex.
How could these levels AND THE BEDROCK have sustained the damage reported and seen in multiple images?
Most of us agree that Towers One and Two were brought down by a highly EXPLOSIVE TOP DOWN controlled demolition, not the official "pancake collapse" so with literally nothing to accomplish the "top down crush" what caused the destruction of the sublevels and what created the holes DEEP in the BEDROCK?
The above is a side by side comparison of the site building #4 was built upon. The topography to the left is pre 9/11, the right, post.