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  • This is the deepest hole

  • mankind has ever dug.

  • It's a straight drop

  • into the bowels of the Earth.

  • For 20 years, Russian scientists

  • and engineers drilled deeper and deeper,

  • hoping to uncover whatever mysteries

  • the hole may hold,

  • earning it the ominous nickname of

  • What would happen if

  • for whatever reason

  • you fell into this hole?

  • So, you managed to take the plunge.

  • You'll start plummeting at almost 10 m/sec (33 ft/sec),

  • and every second after that,

  • it gets faster.

  • If we take terminal velocity out of the mix,

  • and assume you weigh 80 kg (176 lbs),

  • you'd eventually reach a speed of 490 m/s (1,608 ft/s).

  • So as you fall deeper and deeper,

  • Falling at such a high speed,

  • you'll start to notice things getting

  • a little toasty

  • as your heart rate starts to elevate,

  • and panic sets in.

  • You might find it getting

  • a little harder to breathe.

  • Why?

  • At 150 m (492 ft) down,

  • your poor lungs would be getting crushed

  • by the constantly increasing air pressure.

  • You might also encounter what

  • cave explorers like to callfoul air.”

  • Deadly underground pockets

  • of carbon dioxide.

  • Things can't get much worse,

  • can they?

  • Yeah, they can.

  • Less than 3 km (2 mi.) into the trip,

  • you're going to see your skin start to burn up.

  • Literally.

  • And as you continue to fall,

  • it only gets hotter and hotter.

  • This is because you're being pulled closer

  • to the gravitational center of Earth,

  • and its molten core,

  • which is baking the planet

  • from the inside out.

  • A temperature of 80°C (176°F)

  • can severely burn a person's skin

  • in less than a second.

  • At this point in the hole,

  • you're feeling heat of over 180°C (356°F).

  • On the bright side,

  • you've probably already passed out.

  • When you fall out of a plane

  • you can pass out from lack of air,

  • but wake up as oxygen becomes

  • more available,

  • and catch a glimpse of the ground

  • just as you smack into it.

  • Down here, you're not waking up.

  • Okay, so things don't look good.

  • But, let's say you came prepared

  • and wore an atmospheric diving suit

  • to help with the increasing pressure as you fell.

  • It's heavy,

  • but it will help with that breathing problem.

  • In 2016, Luke Aikens jumped

  • from 7,620 m (25,000 ft)

  • without a parachute,

  • and survived without a scratch.

  • Granted, he landed in a net.

  • If he's allowed to have one, you can too.

  • So you land in the net. Great!

  • Including your terminal velocity,

  • you have successfully managed to free fall

  • 12 km (7.5 mi.) straight down

  • at a speed of 200 km/h (124 mph).

  • How long were you falling?

  • Well, factoring in air resitance

  • and terminal velocity,

  • the whole trip took just over three minutes.

  • And now you've got to get back out.

  • This is not going to be easy.

  • But it may not be impossible.

  • In 2018, Alex Honnold managed

  • to scale Yosemite National Park's

  • 914-meter-tall (3,000 feet) El Capitan granite wall,

  • without ropes,

  • in just four hours.

  • Granted, he wasn't wearing

  • a huge suit like you are.

  • This big outfit wouldn't help you climb.

  • And you would need some climbing equipment,

  • to help you get a better grip

  • on the walls of the hole.

  • To answer that, let's flashback to 1971,

  • in the Kola Peninsula of northwest Russia,

  • to be exact.

  • When Russia began work on

  • the Kola Superdeep Borehole.

  • Measuring in at just over 12 km (7.5 mi) deep,

  • the Kola Superdeep Borehole is

  • the deepest hole humankind has

  • managed to dig on Earth.

  • Team Kola had managed

  • to break the world record for drilling depth,

  • trying to get a leg up on the U.S.

  • during the Cold War.

  • Eventually, they encountered temperatures

  • of 180 degrees (356°F,)

  • which melted their equipment.

  • So the hole was capped in 1992.

  • When you're at the bottom,

  • you'd find things are warm, to say the least,

  • not to mention your body would be

  • dealing with air pressure equal to

  • 54 elephants perched on top of your head,

  • weighing in at a whooping 378 tons!

  • Talk about a headache.

  • At least you could admire some of

  • the 2.7 billion year old rocks down there.

  • But really, could something like this,

  • falling down this hole, ever happen?

  • Who knows?

  • To be honest, we're still trying to figure out

  • the equipment requirements

  • for digging this deep,

  • let alone finding someone crazy enough

  • to take the plunge.

  • Luckily, the Kola Superdeep Borehole

  • only has a diameter of 23 cm (9 in.)

  • so it's too narrow for you to trip into.

  • Even with it's record breaking depth,

  • the Kola Superdeep Borehole is only

  • a fraction of the thickness of the Earth's crust.

  • But it does makes you think

  • about what humans are capable of.

  • Could we maybe

  • dig tunnels between continents?

This is the deepest hole

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B1 中級

如果你掉進地球上最深的洞裡怎麼辦? (What If You Fell Into the Deepest Hole on Earth?)

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    林宜悉 發佈於 2021 年 01 月 14 日
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