The usual way we would do this is to start off at the latest phase, which in this case is the contract was in effect and the work was being done, and work our way back through the documentation to find out where it effectively went off the rails.
Now, in this case I understand, and please correct me if I'm wrong, that the successful bid was the lowest of the ones submitted and that it was so low that people were scratching their heads and wondering how this could be.
Is this correct?