You are right. It will take years and require access by the press and various experts. I'm not quite sure it will be allowed, but academics and good journalists certainly have the rigour to piece things together, so I hope it happens. There must be a large amount of footage, photography, testimony to examine. Also, a lot of ground and unmarked graves to excavate. It's terrible to think about, but accurate documentation is at least some gesture of respect for the dead.