Chernobyl's Elephant Foot among five secret sites barred to the public

Science Focus lists five highly restricted locations that governments and scientists keep closed to the public. One is the "Elephant's Foot" – a two‑ton mass of molten corium buried beneath Reactor 4 at the Chernobyl Nuclear Power Plant in Ukraine. Its radiation is so intense that a person could die within minutes of exposure, and the area remains sealed behind massive steel and concrete barriers.

Another is the Svalbard Global Seed Vault on the Norwegian archipelago, an underground facility that stores more than one million seed samples to safeguard the world’s agricultural biodiversity against wars, pandemics or natural disasters. Access is tightly controlled and the vault is designed to remain secure for centuries.

The third highlighted site is the Lascaux Cave complex in southern France, home to over 600 Upper‑Paleolithic paintings dating back roughly 17,000 years. After decades of public visits caused damage from carbon dioxide and heat, the caves were closed in 1963 and now only a few authorized researchers may enter under strict climate‑control conditions.

These locations exemplify the lengths authorities go to protect hazardous materials, irreplaceable genetic resources, and fragile cultural heritage from public exposure.