Finland has spent decades building a tunnel 430 metres into 1.9-billion-year-old bedrock to store nuclear waste for 100,000 years — and the current plan is to seal it, leave no marker, and hope no fut

On Olkiluoto Island, off Finland’s west coast, a tunnel runs 430 metres down into bedrock that has sat largely undisturbed for about 1.9 billion years. The facility is called Onkalo. When it is full, the plan is to seal it, restore the surface, and leave nothing behind to indicate what is underneath. The reasoning, on […]