Yea, the same “depth” as you study everything.
Read the Partin report. He has no equal in demolition.
I talked to people who did detailed analysis in, around, above, and below that site and other nearby sites, and they assured me the truck blew UP, part of the building (2nd and 3rd floors) went UP, then it suffered some serious collapse as the heavier pieces (entire floors) came back down, and debris fell in, on, around, over and beyond the building.
Check out where the truck's main axle ended up. You and half a dozen strong men would have trouble lifting that sucker. This explosion tossed it around like a tinkertoy.
Your General Partin discusses the inability of the explosion to seriously damage the main columns in the upper floor, He did not discuss what happens when the 1st and 2nd floors rise up a couple of inches, and then drop abruptly.
As we know from this and other building demolitions, when that happens EVERYTHING above those floors is broken loose and it falls to Earth.
As an example, check out the Skyline Towers accident (quite close to where I'm now sitting). See: http://en.wikipedia.org/wiki/Skyline_Towers_collapse
What happened was a couple of top floors simply tore loose and fell onto the floor before. That set up a pancake situation and the whole building collapsed ~ no explosives at all.
Murrah had a similar experience when the second floor gave way (disconnected from the main supports) and started a pancake below, and above (stuff invariably gets pushed and pulled into the event).
The explosion per se didn't have to do all that much work for the building to self-destruct ~ just like Skyline Towers.
A related event in Kansas City involved a suspended walkway. When one nut on one suspension column gave way, the whole thing collapsed and many people were killed and injured.
The Twin Towers of the WTC in New York also began pancaking.