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World's most dangerous substance can 'kill you in 2 days' even if you only look at it for five minutes
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Published 15:29 15 Nov 2025 GMT

World's most dangerous substance can 'kill you in 2 days' even if you only look at it for five minutes

With a not so dangerous-sounding name it was left behind by the world's worst nuclear disaster

Jess Battison

Jess Battison

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Even if you were to only look at it for five minutes, the world’s most dangerous substance could ‘kill you in two days’.

While its name may sound like some kind of innuendo nickname or really, just a bit silly, the ‘Elephant’s Foot’ is certainly not something to be messing about with.

According to science magazine Nautilus, just 30 seconds of exposure to the substance will hit you with dizziness and fatigue.

Two minutes and your cells will soon start to haemorrhage, four minutes and you’ll have vomiting, diarrhoea and fever and if you did five minutes, you’ll apparently have just two days to live.

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Many refer to it as the world’s most dangerous object as the substance remains from the world’s worst nuclear disaster to date back in April 1986.

Of course, I’m referring to the infamous incident when reactor Number Four exploded at the nuclear power plant in Chernobyl.

It's the world's worst nuclear disaster to date (Vitaliy Holovin/Corbis via Getty images)
It's the world's worst nuclear disaster to date (Vitaliy Holovin/Corbis via Getty images)

Thirty people died within months of the disaster and thousands more are thought to have died as an indirect result over the years that followed.

The ‘Elephant’s Foot’

Basically, the thing is a big black mass of dangerous waste named due to its appearance given off the façade of the wrinkled foot of the mega animals.

It was caused by the Chernobyl disaster as a large hunk formed at the bottom of the failed reactor which was caused by uranium fuel becoming molten when it overheated.

With the reactor blown apart, heat, steam and molten nuclear fuel combined to make a 100-ton flow of dangerous chemicals pouring through the basement of the plant and solidifying into this ‘Elephant’s Foot’.

It’s reported to be about one metre in size and consist of concrete, sand and melted nuclear fuel amassing to around two tonnes.

The danger of the ‘Elephant’s Foot’

When emergency crews eventually made it to the steam corridor beneath reactor Number Four, they found the black lava and knew not to approach due to the radiation. Instead, cameras were pushed around the corner to capture the dangerous substance.

As the radiation emitted has decreased, it has become slightly safer to approach - which is why more recent pictures show people standing near the molten mass.

It's a good thing radiation can't travel through images (US Department of Energy)
It's a good thing radiation can't travel through images (US Department of Energy)

When it was measured, the big mass gave off almost 10,000 roentgens per hour – described as the equivalent to the exposure given by four and a half million chest X-rays and enough to give a human a lethal dose in just 300 seconds.

In 2001, it still measured 800 roentgens an hour and it’s thought that it will remain dangerously radioactive for tens of thousands of years.

Featured Image Credit: Universal History Archive/Universal Images Group via Getty Images

Topics: Chernobyl, World News, History, Science

Jess Battison
Jess Battison

Jess is a Senior Journalist with a love of all things pop culture. With a specialism in entertainment, she's covered the updates live at major events from The Brits in London to Disney's D23 in California. Jess covers the latest breaking news stories across the UK and the globe as well as interviewing your favourite faces including the likes of Dwayne Johnson, Stephen Graham, Aubrey Plaza and Chris Hemsworth. She graduated with a first in Journalism from City, University of London in 2021.

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@jessbattison_

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