it's about giving them a chance too for a second act. >> and that report from our sarah hoy. looking every day across the world, large amounts of high level radioactive waste created by nuclear power plants are placed in temporary storage. in finland, the first permanent repository is being made out of solid rock, and it has to last 100,000 years, because has long the waste remains hazardous, and we go inside. >> he recognized that this could happen, that you might find an open place. you refer to that as human intrusion. we don't want this to happen because you make it heard, but most of all, we're afraid of human intrusion because it's open, the waste will no longer be isolated from all living organisms, and we will have failed. in fact, we consider you the main threat to the safety. >> if someone in the future is able to dig down to the repository, it will probably be a civilization of the same kind as we have presently, and as such a case, they would also be knowledgeable. to know that this is a radioactive material. >> yeah, i think that's the most probable scenario, but