I do remember there being pictures of part of the crater, but the rest was covered with planking. None of those photos seem accessible now via Google. Who knows, maybe those were fake.
It would be logical that falling debris would fill the crater, making it very hard to discern.
This is the best 'reference' I can come up with .
For one thing, it shows the length of the crater as 28 feet. The crater was actually covered with only eight sheets of plywood -- except for a foot or so of "lip" on each end. The true maximum dimension of the crater (length) was only 18 feet.
The OKBIC report has photos of a Cat tracked excavator (with the bucket replaced with a jackhammer attachment). It was positioned with one track overhanging into the crater -- while it cut the fallen 3' X 5' X 200' "header beam" or "spandrel" into sections that a crane could lift.
Rep. Key flew me to OKC specifically to measure the width of that track. When used as a scale for the photo, the track width yielded the same 18 foot crater length that I had measured by other methods.
The FBI never allowed the BPAT team to approach closer than 200' to the building -- so, they used bogus dimensions fed to them by the FBI. By calculating the explosive size based on a 28 foot crater, they came up with an exaggerated TNT-equivalent charge size. Even that still barely reached the closest column with sufficiently brisant energy to destroy it. In reality, the columns were nearly unscathed at truck level.
Neither the FBI nor the BPAT team of top engineers published any explanation of how that 200' long, 3' thick, and 5' tall reinforced header beam came to be neatly sliced into 40-foot sections with 18-20" of concrete totally missing (pulverized) at each column intersection. (As shown in my drawing, above...)
To make things more interesting, that same, massive beam was totally unscathed in between the missing (red) sections...
How does one do such precise "surgery" to a massive beam, at the third floor level -- with, essentially a single, powerful "puff" of hot air from a truck bomb, out in the street?