Finland Is Building A Cave Located 430 Meters Deep To Store Nuclear Waste For 100,000 Years. Meet Onkalo

Written by Ruth Rodrigues

Published on 01/04/2025 at 19:49

Fonte: Mega curioso

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With a project aimed at ensuring safety for more than 100,000 years, Onkalo represents a breakthrough in nuclear waste management, protecting the environment and future generations from the risks of radioactivity.

Finland is about to inaugurate one of the most ambitious and revolutionary projects in the history of nuclear energy. This is Onkalo, an underground cavern designed to store nuclear waste for more than 100,000 years.

Located on the island of Olkiluoto, on the west coast of Finland, this unique structure in the world represents a milestone in the management of radioactive waste. With an inauguration scheduled for 2026, Onkalo promises to be the definitive solution to the challenges posed by Finnish nuclear waste.

The Onkalo Project

The word “Onkalo” means “cavity” or “hiding place” in Finnish, an appropriate description for this impressive nuclear cavern. The project is located 430 meters deep in a rocky bed, where the radioactive waste from Finland’s nuclear plants will be stored.

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The Importance of the Onkalo Nuclear Cavern

The storage of nuclear waste is one of the greatest challenges of nuclear energy. Although it is considered a cleaner alternative compared to fossil fuels, nuclear energy generates highly dangerous radioactive waste.

The Onkalo nuclear cavern represents an innovative solution, providing a safe and isolated space for high-level radioactive waste, which can take thousands of years to lose its radioactivity potential.

Nuclear waste is classified into three categories: low, intermediate, and high-level radioactivity. While the majority (90%) consists of low-risk materials, such as contaminated clothing and tools, the high-level fraction, although it represents only 3% of the total, carries 99% of the radioactivity.

According to the Nuclear Energy Agency (NEA), high-level waste takes about 10,000 years to reach a radioactivity level comparable to that of the original ore from which it was extracted.

The Signage Dilemma

One of the major challenges of the Onkalo nuclear cavern is ensuring that future civilizations understand the dangers buried there. How to signal the risks of Onkalo thousands of years from now, when we do not know what language will be spoken or if humanity will still exist?

Among the proposed solutions, one of the more radical involves creating a hostile landscape around the nuclear cavern, making the area inhospitable and frightening. Another curious idea suggests genetically engineering cats that would change color upon detecting radiation, creating a lasting legend about “signaling cats” to alert people to danger.

In the short term, Onkalo will feature standardized signage to indicate the presence of radioactive material. However, the future of risk communication in Onkalo remains an enigma to be solved.

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Finland Is Building A Cave Located 430 Meters Deep To Store Nuclear Waste For 100,000 Years. Meet Onkalo

With a project aimed at ensuring safety for more than 100,000 years, Onkalo represents a breakthrough in nuclear waste management, protecting the environment and future generations from the risks of radioactivity.

The Onkalo Project

The Importance of the Onkalo Nuclear Cavern

The Signage Dilemma

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Finland Is Building A Cave Located 430 Meters Deep To Store Nuclear Waste For 100,000 Years. Meet Onkalo

With a project aimed at ensuring safety for more than 100,000 years, Onkalo represents a breakthrough in nuclear waste management, protecting the environment and future generations from the risks of radioactivity.

The Onkalo Project

The Importance of the Onkalo Nuclear Cavern

The Signage Dilemma

Engineers want to carve through Africa with a giant canal to bring water from the world’s second-largest river to a dying lake on the edge of the Sahara Desert that has already lost 90% of its water.

A giant brown band visible from space, approximately 8,850 kilometers long, connected Africa to America in the Atlantic Ocean, and satellites revealed that it is neither land nor pollution, but the largest accumulation of seaweed in the world, which broke records in 2025.

Workers were opening a modern road in Dover when they found, 6 meters below the asphalt, a 3,500-year-old boat made of stitched oak and plant fibers.

Instead of burning or burying old tires, an American city is transforming about 2,000 of them into the street itself, paving its first sections with a quieter and more durable rubber asphalt.

In just one cast, fishermen are surprised to capture 14,096 mullets in Bombinhas and close a historic season with 58,000 fish; scene recorded in the Santa Catarina paradise marks the last day of the 2026 season.

Russia brings to life a prototype of a supersonic passenger jet and aims for the return of commercial flights above the speed of sound with the promise of less noise near airports.

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