All language subtitles for Underland.2025.720p.WEBRip.x264.AAC-[YTS.GG - YTS.BZ]

A mile to the west of
a hill, marked by nine

burial mounds, there
stands an old ash tree.

Her crown reaches skyward, her roots dive
deep into the land.

Many have been this
way before, passing

through the old ash and
into the world beneath.

What is this strange song that calls us
below?

Why do we seek the void?

Some areas of the state in the High
Sierra, strong gusts and heavy rain moving

overhead in the latter part of the
evening.

Travel conditions will be poor right
through to the morning.

Meanwhile, northern areas continue to
enjoy wilder conditions than usual.

Our

journey begins,

somewhere beneath the skin of the
earth, where darkness thickens and sounds.

Stir.

Yet, even here, just inches
below the surface, this is a

place so alien to ours above,
where nothing is familiar

and all is strange.

Yes?

Yes.

Let's go here.

I believe in

this region of Mexico.

Here we have many rivers.

Yes, yes, yes.

Yes.

Yes.

Yes.

Yes.

I am not only fascinated by the sea.

In the early years, there was an entire
population that lived in this region.

It was the Mayas.

They considered the sea, as if they were
living in the world.

The Mayas went to the sea.

The Mayas went to the sea, and there were
many rivers in the interior.

We always find evidence of the activities
that led to this ruin.

Its wealth, its artifacts, all of which I
have been seeking through time.

But in reality, we don't know what we are
going to find.

So it is necessary to explore as much as
we can, and be prepared for what you want.

As I descend, the first thing that hits me
is the smell.

It's kind of a smell of a cave in the
making.

Wet concrete and trash.

Maybe sewage.

You know, after years, decades,
exploring the underground, those smells

now I completely associate with the
feeling of freedom.

When you are in the main system,
all of these smaller systems dump into it.

You wouldn't necessarily
know if it was raining on

the surface until all of
those veins started pumping.

And it's going to turn into a subterranean
flash flood in an instant.

Maybe the past 20 years of my life I've
spent exploring underground spaces.

I actually began my career in archaeology.

Eventually, I ran into these urban
explorers.

These incredible groups of
people who were sneaking

into abandoned places
and photographing them.

And it seemed to me like a kind of
archaeological practice.

I feel like I was really pulled into the
underground.

This is just now what I do.

I guess I've made a whole career out of
writing about things that I find underground.

As a species, our presence
on the earth extends further

into the ground than our
buildings do into the sky.

And one day, after we've gone,
I think this will be all that's left.

So what I want to know is, what do these
traces say about us, about humanity?

What does it say about who we actually are
as a species?

It's so dark in the cage.

You can't see much at all.

It just adds to the sense of fear.

I mean, even for people
who go underground a lot,

I guess, most of them never
go two kilometers down.

I think even when I
was a child, I always was

trying to make sense
of the world around me.

My grandmother would call me Miss Y.

I'd ask her things like, you know,
what are those stars in the sky?

Why are they there?

How was our universe born?

Why do we exist?

The answers just got thinner and thinner
until, at the end, you realize you've

asked a question that nobody in the world
knows the answer to.

As scientists, when we
know we need to try to look

for hard things, we are
often pushed to the extremes.

Extreme energies, or temperatures,
or distances.

In this particular case, we're being
pushed to extreme depths.

That's because sometimes the
experiments you want to conduct

are so sensitive that you just
can't do them on the surface.

There's too much interference from all the
radiation that bombards the planet.

But when you're
underground, at the bottom of a

deep mine, you can
pretty much filter all that out.

That means that you can look for things
that you just can't see up there.

In my case, the thing we're looking for,
if we can actually find it, would go some

way toward answering
the question of how our

universe developed
and why we're even here.

The only problem is, this thing we're
looking for has never been directly detected.

Ever.

So the question for me is, how do you
catch a ghost?

Deeper we dream, far
beneath the roots of the old

ash tree, down through
an ancient rift of stone,

where living walls show we have long been
making these journeys below.

Though those early human eyes encountered
simply so much darkness, since they could

not fill that dark with light,
they filled it with story.

In some of these stories, this world was a
perfect inversion of the human realm,

where the feet of the dead walked soul to
soul with those of the living.

In others, it was a place from which the
roots of a giant world tree drew its

power, one which linked the heavens and
the earth to this land of eternal night.

Today, we have a new environment.

If we can visualize the tips of the trees
that our ancestors used to grow,

we can always understand why we live here.

For me, it is important.

The Mayas are my friends.

My family is from Cienadellos.

And for this, I want to study archaeology.

I want to study people with what I am
connected to.

I am not determined, but...
This is like a... ...a preview.

These are the trees that we are now.

Because the work now is much faster with
this new technology.

We are growing manually.

I see that this is the distance that we
are recording.

We don't know if this is the time.

Do you think it can be done?

Is that okay?

To do what I do, descending is not enough.

I need to find ways to augment my vision.

That's when you really start to see.

Sometimes in the drains, you encounter
what looks like trash.

But then you look closer and you see what
it really is.

People live down here.

People who don't have homes at the
surface.

And who need to escape the heat or the
constant surveillance by police.

You know, in cities
they often say that

wealth rises up into
towers, into skyscrapers.

But it's also true that poverty sinks.

It sinks underground.

Unfortunately that means that when it
rains, people die.

Part of what I do is to document stories
like these.

To make them visible.

The underground is full of secrets like
this.

And documenting those secrets is the
preoccupation of a global community of people.

CM HQ.

There are no windows.

People will be separated completely from
the outside world.

19.

It doesn't look like there's some bits
left.

1978 dating newspaper.

But wherever we are, the drive,
the obsession of this community is about a

feeling that this stuff is just too
precious to rot in the dark.

Unseen.

So we have to do everything we can to
figure out ways to light it up.

And to bring that back to the surface.

These labs have to be kept incredibly
clean.

Only the equivalent of a
teaspoon of dust is allowed

to pass through them over
the course of an entire year.

That's to protect all the equipment that
we have down here.

Equipment that's helping in the search for
what we call dark matter.

Dark matter is... well, we don't know what
dark matter is.

That's the issue.

As black as the midnight sky on a moon
this night.

We think it's a substance or a material.

Just one that we haven't been able to
detect directly.

It's never been seen, heard, or touched.

That's why some call it the ghost.

The only reason we know the ghost is there
is because we can see the gravitational

effect it has on things like the motion of
galaxies.

Even the path of light.

That's how we've actually
been able to map how dark

matter appears to be
distributed across the universe.

And from these maps we can see it's pretty
prevalent.

In fact it makes up around 85% of the
total mass of the universe itself.

For someone like me that
just makes it all the more

frustrating that we don't
actually know what it is.

The leading theory is that it's actually
made up of particles.

But just ones that mostly pass through
regular matter.

But if, even if only rarely,
one of those dark matter

particles were to collide with,
say, the nucleus of an atom.

Well that could tell us a lot about what
dark matter actually is.

The challenge is, how do
you build something that

could catch one of those
events as it actually happens.

In deep underground labs we've built these
massive detectors.

Some of them are more
than 15 meters across and

they sit in flooded
caverns of ultra-pure water.

Which filters out any cosmic radiation
that might have made it this far down.

Down here only a ghost would get through.

The hope is that if we run the right
experiment, one of these detectors,

these giant eyes, will
see a collision between a

dark matter particle and
something in our world.

Asking why is one of the most powerful
things we can do.

It's an act of refusing to accept a state
of not knowing.

In some sense it's like having a load of
doors to choose from.

You go through one and then you meet
another.

Well I mean I think if we
open enough of these doors

then we'll actually end
up finding dark matter.

And ultimately solve one of the biggest
mysteries there is.

The biggest whys.

We've worked out all of the data analysis.

So we'll be good to go with the unblinding
one at a time.

Every time I get to do this
to actually run one of our

experiments, I can't help but
wonder is today going to be the day?

And the pressure?

Great.

Is this going to be the door?

And then we wait.

But it's a waiting game.

Time.

It flows differently in the Underland.

Down here there are no minutes or hours.

Only epochs and eons.

Some call this deep time.

The dizzy expanse of the Earth's history
that stretches away from the present.

But for those who descend, deep time is
also another way of seeing.

One in which things that seemed inert come
alive.

Stone flows.

The Earth has tides.

And ice.

Breathe.

Ice itself is a recorder of deep time.

In the frozen Underland of the cryosphere,
matter has sealed it into layers.

Layers containing ancient
bubbles of air trapped

at the moment of snowfall
many millennia ago.

These deep time messengers
draw a curious view from the

world above into icy
labyrinths carved by meltwater.

Or downgrade tunnels of time drilled from
the surface in

search of air that is more than a million
years old.

Yet the deeper and older we go,

the tighter the Earth's grip.

And the greater its power to hold.

But in these times, we have other
difficulties.

There is a restriction of oxygen.

Taking more time in these
times can result in... fatality.

Like speleologs, everything we know is
history.

This is the beginning.

A

narrow shaft 1,000 feet below the surface.

All attempts to free the man failed and he
eventually suffocated in foul air.

His body now to be permanently left in the
cave to avoid further risky...

...stuck on a narrow ledge in a flooded
cave system.

That's the situation
unfolding in Thailand right now

where a team of young
soccer players await rescue.

Amid the chaos, handwritten
notes passed from the boys to the

dive team telling their parents
on the surface not to panic.

The nine 33 men presumed
dead now found to be

alive two weeks after
the initial collapse.

Their survival is far
from certain as this part

of the mine is more than
2,000 feet underground.

And I think it's raining up there.

We need to go.

Right now.

We need to go.

I always

ask myself, why aren't we passing so
much...

...to do all of this?

With only the light of the sun.

Of the sand-torches.

What happened if the sand-torches
disappeared?

What was the reason why you were so
motivated?

Being so far underground.

You know, you don't see sunlight.

You don't see the day-to-day motions going
on outside the window.

And you go through all of that,
too, to answer a question.

That answer might come.

Or it might not.

All this human effort, all the theory,
the engineering...

...the hours spent underground...

...might it all be for nothing.

When you are in the water...
...you are going to the water.

But you have to cross the
river of the world... ...to get to it.

Deep in the earth, the rift turns again.

We follow, as ancient waters gather.

Starless rivers of myth that mark a
threshold...

...between the worlds of the living.

And the dead.

Here in the Underland lie the remains of
some 60 billion humans.

Many adorned with treasured objects to aid
their passage through the nether.

In once dry cave systems, now flooded by
rising seas...

...there rest bones that have not seen
sunlight for 10,000 years.

Though we cannot know if these were tombs
to worship...

...or ones to avoid.

For into the earth we not only place what
we love and wish to save...

...but also what we fear and wish to lose.

These mines are some of the eeriest
places.

It's so quiet.

These voids, these mineral voids.

Most people go underground to search for
things that are special.

My journeys have always been a little bit
different.

When I go underground, it's not...

...it's not to find things that are
special necessarily...

...but to find what we've tried to forget.

Those things tell just as much of a story.

Around the world we've turned so many of
these old mines into dumping grounds.

People come to these cracks in the surface
just above...

...and they chuck in their old cars and
broken fridges...

...thinking, I guess, that the earth would
forget.

But of course the earth doesn't forget.

As a species, we've blasted our way
through the periodic table.

We've taken all of these elements from the
earth, we've taken treasure...

...and we've thrown it back as trash.

But the thing is, this isn't even the
worst of it.

There's one element that we've mined that
haunts us more than any other.

Uranium.

It's actually pretty hard to spot...

...until you shine a black light on it.

And then the uranium lights up like crazy.

The base level of radiation in some of
these places is six times higher...

...than the Chernobyl site is today.

That's why I use the drone.

So this is what I mean when I say the
underground tells a story.

And this particular story
is about how we took

something from the earth
and created a monster.

And it's a monster that we now have to
contain.

In the

violence of celestial explosions more than
six billion years ago, uranium was born.

Earth's

crust is tin or tungsten, but with a force
beyond imagination.

One which can power entire cities.

This astonishing element we pulled from
the earth leaves another, deeper problem.

A legacy of toxic waste that must one day
be returned to the Underland.

Into sealed tombs designed to outlast
their makers.

Burial sites for this the darkest material
a species has ever made.

In this deep dark it can be hard to dream.

To remember why we're here.

We're going to use natural resources.

We're going to wait until we're here.

We're going to wait?

Yes.

There's a lot of water in the water.

The water.

We're going to analyze the formations.

When the massive wave comes, it's
impossible to see in a day.

We're going to wait.

And when the wave comes, it's impossible
to see in a day.

We have to decide for a moment.

We believe that it's the end of the final.

We can't see it.

Fatima?

What?

Do you feel it's the end of the wave?

No, because we're going to wait.

We're going to wait.

Jose?

Jose.

But no, no...

It's Felix who's talking.

Don't you know?

The people who have when I'm in the water
don't know what people have in the water.

I'm in need of these people.

I'm in the water.

Every day I'm in the water.

For Fatima and me, I'm in the water
through the water.

The color of my soul is in the water.

So...

I want to solve it.

But I can't.

We are together.

More profoundly in the water.

The wave of a rat I don't know what it's
doing.

I don't know what it's doing.

Ah, okay.

Should we start again?

When an experiment
doesn't end up finding dark

matter, you know, it
can be really frustrating.

You sort of ask yourself, are we ever
going to find it?

The experiments can run for months,
sometimes even years.

We keep tweaking the parameters for them
to look in as many ways as they can.

After a certain point,
if they continue to

return null results,
then it will be shut down.

And then at that point, as a community,
we need to decide where to explore next.

The ones that are using DAS targets,
right?

Is it because it's easier to identify the
beginning and end of the track?

But there are plenty of other experiments
to run.

Many doors.

We just have to keep opening them until
there's nowhere left to look.

Exactly.

Ah, the windows!

Yes, the windows.

Stephanie.

Yes, wow!

Yes, I see what the windows do.

The windows?

Yes, they do.

Yes.

Are the windows open?

No.

I don't think so.

Many times in the region, nobody has ever
seen something like this.

Even with different materials.

Very nice.

Thank you very much.

Thank you very much.

We're going to use carbon particles and
we're going to use them.

Yes?

Ten years ago, with the days, with the
months, with the months,

the coloration, the coloration, it's very
probable that carbon is being pulverized.

Are you going to use your hands?

Yes.

Very good.

Very good.

Uh-huh.

You can use your hands.

Like you don't want to?

Yes.

You can use your hands.

More or less.

More or less.

I'm going to use my hands right now.

Ah, look at that!

Look at that!

Look at that!

Look at that!

Look at the sea.

I thought, it's difficult to find this
place for my ancestors.

For this, here, the Mayans decided to use
this sea as a special place.

We are talking about a sea of
Uso-Cotitiano.

We are talking about a sea of ritual.

We are talking about a sacred space.

Here, at our deepest point, stone folds.

The rift ends.

We can go no further.

Our oldest and most treasured stories are
of descents made into the earth.

Of those who answered the call of a
strange song that beckoned them downward.

To this place of secrets, lost to the
dark.

Though now, it is the surface that sings.

That strange and sunlit overworld.

I've definitely thought
about what it would be like if

the answers never came
over the course of my lifetime.

And I've come to terms with that as a very
realistic possibility.

The first person to discover dark matter
might be someone out there right now.

Maybe some little girl
looking up at the night

sky, bugging her grandma
by always asking why.

Every time I venture into the underground
and witness the things that we've left

down here, I can't help but imagine some
future civilization exhuming this stuff,

studying this stuff, and therefore
studying us.

Sometimes I even imagine myself as this
future archaeologist.

Thousands of years from now, I imagine
finding a sign in the earth warning me of

what's buried there, telling me not to dig
it up.

These signs are things we're actually
making now, in the present.

And of course, on one level, it's,
it's horrific.

But the fact that we're thinking about the
well-being of future generations,

maybe even in 10,000 years, gives me hope
that humanity has, has some care.

And you see there a
possibility of, of moving beyond

just thinking about ourselves
or the next generation.

We move into deep time.

A space where we can imagine ourselves as
ancestors.

I'm going to begin to understand what I
want to express my past experiences.

Everything is interconnected.

Everything is interconnected.

Out to the island on the horizon following
the path of the sun

following the path of the sun

Over the sandbar holding the North Star
Steady between must and spark Creek of the

old and town of the hour It was keeping
watch for the power, watch for the waves,

breath, watch for the moon's death.

Down in the waters of day.

Fairy man, fairy man, carry my memory on.

Out to the island, on the horizon.

Following the path of the sun.

Following the path of the sun.

For the stone ones are broken,
my sadness is woken.

Sea roads are mistaken.

So stung by the aviation forces.

If we grow weak and frail.

And with arms made of granite and a blaze
of gannets.

We broke this planet.

Fairy man, fairy man, carry my memory on.

Out to the island,
on the horizon.

Following the path of the sun.

Fairy man, fairy man,
carry my memory on.