Chernobyl was the accident that the nuclear power industry said would never happen.

Early in the morning of April 26, 1986, four reactors exploded at the Chernobyl nuclear power plant, Ukraine. It caused what the United Nations has called “the greatest environmental disaster in the history of humanity”.

Twenty-five years later, the nuclear accident in Fukushima, Japan, reminded us that the risk of another accident like Chernobyl still exists, wherever nuclear power is used.

The long-lived radionuclides released by the Chernobyl accident mean the disaster continues – 30 years later. It still affects the lives of millions of people.

Here are 15 facts you may not know about the Chernobyl disaster:

1. 30 years ago, reactor 4 exploded in the Chernobyl nuclear power plant, located in Ukraine. Nearly five million people still live in contaminated areas.

A mother and her two children pose with a potato cart in Ukraine
Family with potato cart in Ukraine. © Denis Sinyakov / Greenpeace

2. The amount of radioactive radiation emitted is about 200 times higher than the total emission from the atomic bombs that fell over Nagasaki and Hiroshima.

An abandoned room full of rusty, broken beds is what remains of this preschool in Pripyat
The remains of a preschool in the city of Pripyat that was left abandoned after the Chernobyl disaster. © Steve Morgan / Greenpeace

3. People in the nearest town, Pripjat, were evacuated only two days after the disaster. By that time, many people had already been exposed to high levels of radiation.

An old lady sits in her house in the 30 kilometres zone of Chernobyl
People have come back into their villages in the 30 kilometres zone of Chernobyl after the nuclear accident, although the radiation is still high. Mostly old people who want to stay in their houses. © Jan Grarup / Noor / Greenpeace

4. Radioactive rain fell as far away as Ireland. Ukraine, Belarus and Russia were the most affected countries. 63 percent of the radioactive fallout from Chernobyl hit them.

A woman passes through the decontamination center in Pripyat.
The decontamination center in Pripyat. © Clive Shirley / Signum / Greenpeace

5. Since the city of Pripjat was abandoned by humans due to high levels of radiation, wolves, wild horses, beavers, wild boar and other animals have populated the city.

Wild horses in Pripyat in front of sarcophagus of Chernobyl Unit No 4
Wild Przevalsky horses from the Ukrainian nature reserve Askania-Nova were introduced into the Chernobyl exclusion zone. Despite the fact that they feed on radioactive grass, they all look well.© Vaclav Vasku / Greenpeace

6. Animals that live in the safety zone around Chernobyl’s nuclear power plant (3 km) have higher mortality, increased genetic mutations and decreased nativity.

A skinny stray dog walks down the street ​​in Pripyat
Stray dog ​​in Pripyat. Abandoned and stray dogs are the only inhabitants of the town of Pripyat, which is now completely deserted. © Vaclav Vasku / Greenpeace

7. One would think the other Chernobyl reactors were also shut down immediately. But instead, the operation of the three other reactors at the nuclear power plant was resumed and operated for a further 13 years until finally closed in 2000.

A photo of Reactor 1 and 2 at Chernobyl's nuclear power plant, 11 years after the accident
Reactor 1 and 2 at Chernobyl’s nuclear power plant. This picture was taken in 1997, 11 years after the nuclear accident at Chernobyl in April 1986 © Greenpeace / Stefan Füglister

8. There are still radioactive substances, encapsulated in a decaying cement sarcophagus that was built over the reactor after the accident. A new solid shell is being built over the current sarcophagus. But it is only expected to last for 100 years.

The new giant sarcophagus to enclose the wrecked reactor
The new giant sarcophagus to enclose the wrecked reactor. The structure is intended to prevent the reactor complex from leaking radioactive material into the environment © Denis Sinyakov / Greenpeace

9. The nearby forest near the disaster is called “the red forest,” after high levels of radiation killed the trees and left large areas of pale red dead pine.

A person shows the reading on a handheld nuclear radiation monitor. It reads 839 microroentgens per hour
Measurement of radioactivity in the “red forest” in Pripyat. After twenty years radioactive contamination here is still very high. Dosimeter shows well over 800 microroentgens per hour.  © Vaclav Vasku / Greenpeace

10. The nuclear industry and the governments of Ukraine, Russia and Belarus want to spend billions on new nuclear projects while neglecting their responsibility to support the survivors of the Chernobyl accident. They reduce the effects of the disaster and reduce the hardships people around Chernobyl have to live with.

A woman sits in her kitchen with her child on her lap
The village of Drosdyn, near Chernobyl. The village is 200 km west of the nuclear power station Chernobyl. Due to the sour earth, everything growing there is radioactive-contaminated. © Jan Grarup / Noor / Greenpeace

11. Now you can also book a trip to the Chernobyl zone! Tourist agencies organize day trips in the abandoned city of Pripjat, right next to the wrecked nuclear power plant.

People in protective gear walk towards the site of "New Safe Confinement"
Thirty years after the Chernobyl nuclear disaster, Greenpeace re-visits reactor 4 and the new so-called “New Safe Confinement”. © Denis Sinyakov / Greenpeace

12. Pripjat is a heavily contaminated city and will remain abandoned by humans as there are residues of dangerous plutonium in the area, a substance that has a half-life of 24,000 years!

The abandoned city of Pripyat in Ukraine
The abandoned city of Pripyat in Ukraine. The Chernobyl plant is visible in the far background. © Denis Sinyakov / Greenpeace

13. The radiation was so strong that the color of firefighter Vladimir Pravik’s eyes changed from brown to blue.

A man sits outside a derelict hospital in Pripyat
Abandoned hospital in Pripyat. Radioactive contamination in Pripyat is still very high. One needs a special permit to enter this area. © Vaclav Vasku / Greenpeace

14. Sweden was the first country to inform the world about the disaster, after the Soviet government initially secretly covered the accident.

An aerial shot of the deserted city or Pripyat in 1995. The Chernobyl nuclear power station is visible in background.
The deserted city of Pripyat, Ukraine in 1995. The Chernobyl nuclear power station is visible in the background © Clive Shirley / Signum / Greenpeace

15. In the contaminated areas, the Chernobyl accident affects every aspect of people’s lives. Radiation from Chernobyl’s nuclear power plant is found in the food they eat, in the milk and water they drink, in schools, parks and playgrounds, and in the woods whose firewood they burn to keep warm.

A resident sits on a stool behind a market stall containing mushrooms, peppers and other produce, in  a local Russian market.
Residents sells local produce in a local Russian market. Here the food does not pass radiation control. © Denis Sinyakov / Greenpeace