Terrifying Simulation Reveals What Would Happen If Oxygen Vanished From Earth For 5 Seconds

A jaw-dropping simulation shows what could unfold if the world suddenly lost all oxygen for just five seconds—and the results are far worse than you'd expect.

While nitrogen makes up 78 percent of our atmosphere, oxygen comes in at 21 percent. Even though it’s not the biggest component, oxygen is crucial—not just for breathing, but for many vital systems on Earth.

It might seem like no big deal since most of us can hold our breath that long. But as the simulation explains, this tiny window without oxygen could bring global destruction.

Turns out, losing oxygen even for a moment would have a massive impact, according to a viral video that’s been making the rounds online.

The YouTube channel ‘What If’ shared a simulation breaking down the immediate changes Earth would face.

While your lungs might still feel normal for those few seconds, nearly everything else would go haywire.

The simulation has shown what would happen Getty Stock Photo

'Instantly collapse'

Buildings and structures made from concrete would begin to crumble right away.

That’s because oxygen plays a big role in keeping concrete solid and strong. Without it, those foundations would give out fast.

Fused together

Any untreated metal surfaces would fuse together almost instantly. The oxidation layer that normally stops metal pieces from welding themselves together would be gone, leading to everything sticking in place.

Planes would immediately drop out of the sky Getty Stock Photo

No-zone layer

If you were outside, you’d be hit with an immediate sunburn. That’s because the ozone layer, which shields us from harmful UV rays, relies on oxygen to function. Without it, there’s nothing stopping the sun’s rays from reaching your skin.

The simulation adds: "In addition to sunburn, our inner ear would explode. Losing oxygen means losing 21 percent of our air pressure, and losing that is the equivalent to being at sea level and dropping down 2,000 metres instantly. Our ears wouldn't have enough time to adapt."

It's raining planes

With no oxygen, fire can’t exist. So all combustion engines—like those in most cars and airplanes—would fail instantly. Planes would fall out of the sky, and only electric cars would still be able to run.

On top of that, the Earth’s crust would start breaking apart. That’s because around 45 percent of it is made up of oxygen, so a sudden disappearance would be catastrophic for the planet’s structure.

Lights out

Without oxygen, the sky would turn pitch black. That’s because the atmosphere wouldn’t be able to scatter sunlight as it usually does. The absence of scattered light would make the world go dark in an instant.

Normally, sunlight hits particles like oxygen molecules and bounces around, giving us daylight. But in this case, the light just wouldn’t spread the same way.

Geoffrey Widdinson, a Process Engineer based in Texas, offered more insight into the bizarre situation.

He said: "In terms of breathing, we probably wouldn't notice. Our bodies can't detect oxygen deficiency, we can only detect high carbon dioxide levels. As long as CO2 isn't building up in our blood, we don't feel like we're suffocating."

"Actually, it would be disappointingly undramatic."

"The phenomenon of a hundred million cars stalling at once would get some attention, and people monitoring air pressure would notice the blip there, but we'd never figure out the cause and eventually just shrug it off."

Luckily, there’s no need to panic. This doomsday scenario is purely theoretical and not something we’ll ever need to worry about in real life.