The final resting place of Canada’s most radioactive nuclear waste could be a cave about as deep below the surface as the CN Tower is tall.

If it happens, the chamber and its network of tunnels will be drilled into bedrock in the Great Lakes basin. Pellets of spent nuclear fuel — baked into a ceramic form, loaded into bundles of metal tubes the size of fireplace logs, then placed into a metal container encased in clay made from volcanic ash — will be stacked in the underground chamber sealed with concrete 10 to 12 metres thick. Though the radioactive pellets will have spent several years cooling down in pools and concrete canisters, they will still emit so much energy that their presence will heat up the space where they sit for 30 to […]