MILLIONS are turning to YouTube tutorials explaining how to survive a nuclear attack.

YouTubers Gregory Brown and Mitchell Moffit – who are name-checked in Forbes' 30 under 30 list – yesterday uploaded a video advising fans on protecting themselves if a warhead was dropped.

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The , but it's just one of several terrifying tutorials being watched by millions.

There was concern across the globe as the Doomsday clock moving 30 seconds closer to midnight yesterday.

It's the closest we’ve come to Earth’s annihilation since 1953.

Scientists use the clock face to symbolise the danger humans posed to our own survival.

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It was designed in 1947 during the rush to create a devastating nuclear weapon.

Experts working on the Manhattan Project, America's atomic bomb, wanted a way to demonstrate how close we were to widespread global doom.

The clock was changed from 11:55pm to 11:57pm in 2015.

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The surge in online searches for what to do if an atomic bomb was dropped was picked up by typically cheerful Canadian YouTubers AsapSCIENCE.

Their latest clip"how to survive nuclear war", makes a stark contrast from their usual offerings, which typically explain how parts of the human body works.

Michael Moffit tells viewers: "We wanted to put together a list of things you can do to be prepared."

He advises packing an emergency supply kit, preparing battery-powered devices, as smartphones and computers will be wiped out by radiation.

He also suggests finding a dedicated safe-house that can be accessed from your home and workplace in 30 minutes.

Terrifyingly, Moffit says that those affected by radiation or burns in the event of a nuke attack will be sifted into "those who live and those who die".

He signs off with "this is a horrible situation, but hopefully these tips will help you if you ever find yourself in this situation".

Interest in similar videos has spiked recently as panicked people search for how to prepare for the worst.

YouTuber  states: "A nuclear warhead has the destructive potential to vaporise Iraq, flash-boil water, cause winds stronger than any hurricane and spread its radioactive fallout over a wide area."

But the narrator claims that nuclear warhead attacks are "a lot more survivable" than first thought.

Simply "duck and cover", run for the nearest vault and give yourself a shower after radiation exposure, they add.

The viral clips are growing in popularity along with the trend for prepping, too.

Brits splashed out on gas masks and radiation suits following the election of Donald Trump as US president.

The rich are getting in on the fun, too.

Billionaires are buying up islands and luxury bunkers in anticipation of all-out war.