Into Eternity

We go deep into the Finnish underground, where the world's first permanent storage of nuclear waste is being built. The storage must be sealed for 100,000 years, the time the waste remains hazardous. But how can we prevent our descendants from opening it? How can we stop future archaeologists if they think they might find the pyramids of our time, mystical burial grounds or hidden treasures? Which languages and signs will they understand, and if they understand, will they respect our instructions?