Original subtitles

WATER DISTRIBUTION STATION

DO NOT DISCRIMINATE DISTRIBUTE FAIRLY

RESPECT HUMAN RIGHTS WE DEMAND FAIR WATER DISTRIBUTION

Please help us abolish the classifications.

We need your signature, sir.

We need your signature.

Please, we need your signature.

Thank you.

Hey!

You're cutting.

You're cutting. I saw you.

All patients of the Third National Medical Center.

The Third National Medical Center provides the best care

to help you return to a healthy, productive life.

If you have any questions during your stay, feel free to...

You'll need a higher water grade

to mitigate the effects of her condition.

If it gets worse,

she may lose her legs completely.

There isn't much we can do, unfortunately,

given your current water class.

I'm sorry for the situation.

THE TRUTH COMES OUT

That's water?

It's water.

It looks normal, but there's something off about it.

What are you talking about? What's unusual about it?

Its solubility, surface tension,

and other properties are like water.

But the mass and the density aren't.

The absence of microorganisms means it could be distilled.

But the weight, it's like heavy water.

It can't be heavy water.

The freezing temperature was far lower than normal

around minus 80 degrees Celsius.

It became less active as the temperature dropped.

But I think it is still water.

ELEVATOR GATE A BALHAE LUNAR RESEARCH STATION

I can't look. I'm too freaked out.

Make sure your anchor is rock solid.

If you slip, that's it.

Once you're down there, you'll see the power control.

As soon as you turn it off,

I'll go in and start revising the protocol.

While I do that, you can replace the panel.

And once I give you a sign...

Huh?

Hey, what...

What's happening?

That's, uh... Can you stop it?

- You got to stop it now. - Hang on. I'm trying.

Wait. Why is the elevator moving?

It's completely out of control.

Captain, you... you have to get out of the way.

Oh, shit!

Hit the emergency brake.

Yes, sir.

The emergency brake won't work.

Captain, get out of the way!

Wait, no!

- You have to move! - Captain!

Captain, are you okay?

What?

What's going on?

Is it working?

I think so.

Captain.

I'm fine.

What happened?

I'm not sure, Captain.

The malfunction could be due to the lack of power.

I thought the elevator wasn't working.

What the hell happened?

Captain, are you all right?

I'll come down to you, Captain.

Drop the rope.

- Throw the rope. - What?

- Captain? - Throw the whole thing down now!

What's going on? Captain?

What?

Captain!

- Captain! - Captain!

- Sir! - No!

Oh!

Damage to oxygen system...

- Captain. - ...detected.

Captain!

- Damage to oxygen system detected. - Can you hear me, sir?

Sir!

Sir?

Captain! Are you okay?

Stay with us, all right?

Stay awake.

Captain!

Are you all right, sir? Hello?

I'm fine.

What a relief, sir.

I thought for sure we'd lost you.

I'll be done shortly.

Oxygen level, nine percent.

- Damage to thermoregulator. - Captain.

You shouldn't proceed any further.

You have to come back as soon as possible.

I'm okay.

Damage to oxygen system detected.

Damage to oxygen system detected.

All right, I found it. What's next?

Pull down the lever to replace the device,

then turn off the power switch on the right.

Signal detected. Revising the protocol.

Rebooting.

One minute until the system reboots.

Replace the panel now.

It's the second panel from the left.

Damage to oxygen system detected.

Damage to oxygen system detected.

Damage to oxygen system detected.

Panel replaced.

Thirty seconds until the system reboots.

I don't understand.

Why did the elevator in that particular shaft suddenly move?

I have no idea. I can't control it. Don't know what happened.

This place has some bad juju.

Things have fell off from the very beginning.

Connect life support system immediately.

Connect life support system immediately.

You have to come back right now, sir.

System rebooted.

Now, reset the switch, then the lever.

Connect life support system immediately.

Sir.

You should come back right away. Can you make it?

Connect life support system immediately.

Sir, you need to come up now.

Connect life support system immediately.

Connect life support system immediately.

Captain.

- Sir! - Captain! Are you all right?

- Oh, no. - Captain!

- Captain, please! - Officer Gong! Captain!

Say something!

- Do you see the Captain, Officer Gong? - Captain, can you hear us?

- Captain! Sir! - Captain, can you...

Please, say something!

Even if its molecular structure is different from what we see on Earth,

it's water.

The bodies showed obvious signs of drowning.

But I still don't understand how that much water

could be stored in a single body.

I know.

At first, I thought it could be secondary drowning.

But think about Soochan. No way.

Secondary drowning?

So there are different types of drowning?

If you get water in your lungs,

it can cause pulmonary edema, respiratory failure.

And if enough fluid fills the pulmonary air sacs

and you don't realize it, it can be fatal later on.

Does that mean you literally drown because of the water in your body?

How long does it take

for the symptoms to start showing?

It depends on the case.

They could show up in under an hour, but sometimes,

people collapse in a day or two.

But the amount of water Soochan threw up...

Yeah, I know. He could've never had that much water in his lungs alone.

How can the amount of water in his body

expand to his lungs, chest and throat?

It's just impossible.

But the water...

The quantity stopped increasing after he died.

And so?

It multiplies quickly while the host is alive,

then it stops increasing when the host dies.

Are you saying that this water is a virus?

Captain.

Captain, are you all right?

What happened?

You lost consciousness due to lack of oxygen.

I think you should head over to the infirmary.

I'm fine.

And the comms?

We're trying.

Are those all different types of viruses and germs and stuff?

There just aren't any matches here.

He was definitely infected by something.

If it's not in our data, it must be some kind of extraterrestrial virus.

Even if you're right, do you really think

that's what killed everyone five years ago?

Everyone else here is completely fine.

So it can't be airborne.

That means Soochan must have been exposed to contact with an infected host.

But how did it spread so quickly five years ago?

What's wrong, Doc Hong?

I can't remember the last time I saw such clear water.

Hey, Captain.

Are you all right?

How's it going?

It looks like comms are still down.

It didn't work?

The DU wasn't the problem?

The panel was replaced,

and the system was rebooted without any issues.

Yeah. The system is showing that everything is fine,

but there's no exchange of signals.

Maybe...

The system's hardware itself was damaged in the accident.

But you just said the system is fine.

But if there's a problem, the system may not be able to find it.

At the moment,

we can't send or receive signals.

Any backup radios?

Every single communication device in the whole goddamn station is down.

I've been searching for a signal internally, just in case,

but I haven't come up with anything, so far.

Of course. I should've checked that first.

Don't say that.

I do what I can. I can't be the only one who's spacing out all the time.

UNKNOWN SIGNAL DETECTED

What's that?

Oh, wait, we got something.

We caught a signal.

UNKNOWN SIGNAL DETECTED

Could it just be one of our communication devices?

No.

It's clearly coming from outside of the station.

But I don't think any of us are out there right now. Right?

Where is it being sent?

Storage Three.

The murderer always returns to the scene of the crime.

Who's sending the signal from outside?

Whoever it is, I bet they're with the rat we found at the station.

If the intruder had a separate communication device,

then they'd probably know what we're up to by now.

Huh?

Why is nobody here?

What? But why would he have something like that with him?

I didn't like him from the moment I saw him.

But why do you think the intruder killed him?

You're right.

Weren't they on the same side?

I don't know what the hell's going on.

Are you able to figure out who sent these?

I think he used an older model for security.

Not sure I can crack it, but I'll give it a shot.

I've seen RX guys use this model.

Do you think we can get connected to Earth?

Yeah. We've got a good chance.

Let's try and get in contact with Director Choi.

Yes, sir.

He probably tampered with the biosignal to lose you two.

And of course, we fell for it.

What about the cause of death?

They died from a rapid increase in water levels in the body.

We're still trying to find the exact cause.

That's weird.

Everything is connected.

So weird.

It should be working. I don't...

It's connected. We're connected. Look!

CONNECTION ACCEPTED TEAM A, SAA

Captain, we've got it.

We'll talk soon.

So, three died,

and one of them was a spy?

Things are worse than I expected.

You're the one who approved the co-pilot change,

right before we left.

Once Internal Affairs hears about this,

they'll conduct a thorough investigation

into the motivations for the replacement.

Obviously, that'll include me.

Do you think there's a possibility

that there are other members working with him?

We can't rule it out.

What matters is,

that we catch the intruder who took that sample.

So you think it's more important for us to catch the intruder

than to retrieve the sample?

You of all people should know how valuable these samples are.

We can't let anyone else get a hold of them.

We'll need full access to level-one areas to search thoroughly.

CLOSED

ENTER THE CODE

Dr. Song, where are you?

Oh, right. I'll be there soon.

They've been talking for a while.

"We sent a rescue ship. Come on back."

I hope that's what she says.

Goddamn it, man. Oh!

A survivor?

I don't actually agree with Dr. Song's theory,

but the circumstances of the co-pilot's death were questionable.

What do you mean, Captain Han?

There are no signs of radiation leaks in the station.

But I think you already knew that, right?

What?

You seemed shocked when I mentioned the spy,

but then you acted completely indifferent

when I said there could be a survivor.

You're the first person to tell me

there are no signs of radiation leakage.

And it's...

It's because you mentioned someone could be alive even...

Even though it's been closed for five years.

Captain Han,

it sounds like you're starting to believe Dr. Song's absurd theory.

If you're hiding information that could jeopardize

the safety of myself and my crew,

completing the mission is no longer my priority.

Well...

as chief of this mission,

I, more than anyone, want the crew to return safely.

There's no reason for me to hide anything from you.

You have to complete this mission.

Not just to save your daughter,

but to offer hope to every one of us.

There's absolutely no sign of a virus.

This is the last one.

The last what?

How long do we have to do this?

What?

Just a second.

What is it?

What are you doing?

I want to try something.

What's that?

Why is it doing that?

It's dividing.

Wait!

What is it? Is something wrong?

Back up. Stay back.

- What? - Hang on.

Wait.

It stopped.

What was that? Why...

Why did it do that?

Blood stays alive for a while outside the body.

That's why it reacted that way.

This must be what killed Soochan.

Once the host died,

it stopped multiplying.

Water that multiplies...

So, the rescue ship will be delayed?

We need more time to find the intruder and the sample.

Do we have a plan to capture the intruder yet, Captain?

We should take them alive.

But if you've already retrieved the sample,

then you can shoot to kill.

Copy that. We'll go start the search, Captain.

- Okay. Taesuk and Sun, come... - Captain.

She's doing this

because we have no way to get back right now.

She's just using the rescue ship as leverage.

But this is not how she should ask to extend the mission.

It's not how things are done.

Then what do you suggest?

Well, I'm not saying I have a specific plan.

Let's stay focused.

Yeah. I'm sorry, sir.

Is it water?

The sample we're here to retrieve.

Is it water?

You knew, didn't you?

I'm sure you're well-aware of global competition

for extraterrestrial resource developments in the past.

The Moon wasn't an area of interest.

Nobody found much of anything else,

so most countries pulled out pretty quickly.

However...

we decided not to give up on the Moon.

We turned out to be right.

We actually discovered...

something very profound.

What was it?

Water.

It was the perfect chance for us

to catch up to other developed countries as newcomers in the industry.

Dr. Song Wonkyung called it...

"lunar water."

Balhae Station was where they first studied lunar water.

Is there really water on the Moon?

That's all Director Choi told me about that mission.

She said we found water,

and if the research was a success, then...

we could save the human race.

Why did you hide this from us?

Why did you go to such length to keep it a secret?

Isn't it obvious what could happen if this gets leaked?

Lee Gisu is dead, but someone else is bound to come after us.

No. The real reason Director Choi didn't tell us about the sample

is because that water is what killed everyone at Balhae Station,

including Soochan.

What... What do you mean?

Um, we think we know what killed Soochan.

It looks like

he was exposed to lunar water.

We don't know when.

And we aren't completely sure,

but it seems to act a lot like a virus.

It continues to multiply until the host dies.

Really?

The water is able to multiply?

Yes.

It multiplies endlessly.

It must have seemed like the perfect resource.

If we could control the way it multiplied, if we could commercialize it,

they probably thought it could save mankind.

If that's possible,

it should happen.

My sister,

she tried.

Song Wonkyung.

Yes, Song Wonkyung.

My sister

wanted that too.

Oh.

Look at the Moon.

Do you see all those dark spots?

It's called "Mare Tranquillitatis."

The Silent Sea.

Long ago, Galileo thought it was all water.

That's why he decided to name it the Silent Sea.

But once we got to the Moon, there was no water.

It's just like here.

I heard all of this used to be an ocean a long time ago.

The Earth will end up like the Moon.

Right?

Don't worry so much.

One day, I'll fill all this up and make it a sea again.

You will?

Mm.

Wait and see.

One day, it'll happen.

You can see why everyone risks their lives to come and get it, huh?

If you could pull it off, you'd make a fortune.

Yeah, but there's still no way to control it yet.

You're right. You can't control it.

We don't even know how people get infected.

How about us? Are we going to be okay?

Why not?

Whatever.

I guess I'm just going to hold out until the rescue ship finally gets here.

If we can learn how to control the lunar water,

we could live in a world without any kind of classification cards.

How the hell would that happen?

She doesn't tell us a thing about the mission,

and then we end up losing Soochan.

I was told it's still being researched,

so the substance is very unstable.

And it's vulnerable to external stimulus, so it has to be kept at a low temperature.

That external stimulus

means coming in contact with a living organism.

The researchers here died from lunar water infection.

But the government covered everything up to pretend like it doesn't exist.

We don't know the symptoms or how you contract it.

There are just too many things we don't know.

I'm not angry at you or blaming you.

All I'm asking is for more information.

I was against it.

When I found out you're Dr. Song's sister,

I didn't want you joining the team for this mission.

I don't understand why you came.

My sister was calling me here.

What do you mean calling you?

You said...

Director Choi gave you the code to restricted areas.

The station's data,

is all located inside the main lab storage.

And in order to get in there, I need someone with level one access.

I mean, her sister was the chief here.

How could she not know a thing about...

About lunar water?

So you're suspicious about her?

Well, no. That's not what I mean.

I guess...

I just don't really get

why she's on this mission at all, you know?

She was curious, and it was unfair.

If someone in your family died and you didn't know why,

if everything you knew seemed meaningless and nothing changed,

you could be at the end of your rope too.

And Soochan...

I know he'd agree with me.

But I'm not saying I would ever put that before the mission.

How did you know about this?

I just got lucky.

What do you think that you're going to find in here?

The answer.

Data storage is off-limits to anyone without authorization.

I know.

Let me go in by myself.

Unfortunately, I don't trust you yet.

CLOSED CODE VERIFIED

OPEN

This is a huge amount of data.

There should be a browser somewhere in here.

What is that?

These are plants.

ALL CHARACTERS, LOCATIONS, ORGANIZATIONS, NAMES, AND INCIDENTS

ARE PRODUCTS OF THE IMAGINATION OR USED FICTITIOUSLY.

ANY RESEMBLANCE TO REALITY IS ENTIRELY COINCIDENTAL.