Every day, the world over, large amounts of high-level radioactive waste is placed in interim storages which are vulnerable to natural disasters, human-caused disasters, and societal changes. In Finland, the world's first 'permanent' repository is being hewn out of solid rock--a huge system of underground tunnels that must last hundreds of thousands of years. Once the waste has been dumped and the ground is full of this waste, the land is to be sealed off with concrete and "never be opened again." Or so the builders of this dump can hope. But can they ensure that? How is it possible to warn future generations of the deadly waste that's left behind by this culture? How do we prevent future generations from thinking they have found the 'pyramids' of our time, mystical burial grounds, or hidden treasures? Into Eternity is a film about the insanity of nuclear power and the consequences that have impacts for hundreds of thousands of years.