You can ignore the quote marks in the previous sentence, since that's not verbatim, but honestly, the written procedure was no more detailed than that.
Because it COULDN'T be. You could never know beforehand where the hole would be, how big it would be, or what you would have available to cram into it.
When you deal with a complex mechanical system, there is simply no way of predicting how it will fail when it finally does. Speaking from experience, nothing delights one of these aforementioned systems more than going kerblooey in a new and exciting way that you couldn't have seen coming, even if you spent all your time inspecting the system instead of operating it.
In short, BP's oil rig failed (as all complex mechanical systems do) in a surprising way, the specifics of which could not have been predicted. They could only be dealt with in the aftermath. Criticizing BP for lacking omniscience is a fool's pastime.
'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.
Teeth Bleaching Glasgow|Invisalign Glasgow.'.'
'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.