Original subtitles

Your mission for today is to find out whether the six crew members are alive

and investigate what happened.

Agents of Mystery!

-Let's go! -Let's go!

-There's water! -This is insane.

I don't think...

Should the lines connect?

-It's working! -Come here!

It's a dead body.

-What the heck? -The oxygen level went down.

Should I turn it?

Should we reboot the central computer first?

-It might be in the lab. -There's a laptop here.

It says "Level R..."

-I found it. -No way.

This ID has an S on it.

We need to open the door first.

What's that?

-What's wrong? -There's a person.

Something's leaking.

Something's leaking.

This is just...

Why are all their heads missing?

Maybe a monster ate all their heads.

-Maybe it eats brains. -Maybe.

That must be it.

He's Ji Young-koo.

-Just a moment. -What is it?

Look at this.

Some kind of fluid is leaking from the ceiling.

-It keeps dripping. -Is it saliva?

It won't stop.

It could be a monster.

Hold on.

Something's up there.

It's moving around up there.

Through the vents.

We need to be quiet.

It really was its saliva.

-Are you okay? -I got a cramp in my shoulder.

It's Ji Young-koo.

-He's Level R. -Yeah.

-Access Level R. -Right.

-He's Level R. -Have a seat over here, Hye-ri.

Let's do this first.

-Okay. -Let's do it.

JI YOUNG-KOO, HEAD RESEARCHER

Okay.

When we opened the card holder,

we saw something that looked like Morse code.

Just a second.

ONLY AUTHORIZED PERSONNEL MAY ACCESS THIS LAPTOP

-Let's pretend this barcode was shorter. -Yeah, you got it.

If you ignore most of the barcode

and just look at the very bottom,

it kind of looks like Morse code.

There are dots, short dashes, and long dashes.

So we matched those with their letter equivalents

to crack the code.

All right.

The first part is a long dash, dot, and short dash.

And then a dot,

and a long dash.

That's the letter A, right?

Right? It's an A.

Next, a dot...

Something's written over there about the central computer.

"If the central computer system fails,

all AI and automated systems will cease to function."

"Must be resolved immediately."

Here's the organization chart.

It's organized by access levels.

Jang Man-gyeong's is the highest.

CHAIRMAN OF THE COUNCIL JANG MAN-GYEONG

-This is the meeting room. -Right.

The cockpit is right ahead.

At the oxygen level we're at right now,

we'll experience increased breathing and pulse, migraine, and nausea.

If it goes below six, we'll die within six minutes.

Can I talk to you about something, John?

This might not be our priority.

-We need to solve the oxygen problem. -Okay.

But we're almost there.

-But the central computer's here, right? -Okay.

So I think we should go to the cockpit first.

We had to get to the cockpit to restore the oxygen level.

I was honestly just so anxious and worried

when I saw how low the oxygen level had gotten.

I was focusing on the fact that we had to get it back up.

So we need to get to the central computer,

which is in the cockpit.

-It's right there. -That's where the central computer is.

-Let's open it up first. -Okay.

Let's do it.

-You got it? -Yes.

-That's it. -There.

It's ready.

-Press the button. -Okay, here we go.

-Ready? -Go for it.

I'm so scared.

There's another one.

I hate this.

We found another body in the cockpit.

And as we expected, it had been decapitated.

Am I in charge of inspecting all the dead bodies now?

Pretty much.

-What are those in his hand? -Who is he?

-I think they're the memory cards. -Really?

Let's grab those.

This is the central computer's external server box.

We need a key to unlock it.

Has anyone found a key?

-No. -Wait.

It's Jo Jong-sun, the highest-ranking member.

-Jo Jong-sun? -Yeah.

-He's the boss. -No, that's Jang Man-gyeong.

Oh, he's the navigator.

Either way, he's Access Level S.

-So the central computer is here, right? -Yeah.

-Is this it then? -I think so.

-We have to reboot it. -Here are the instructions, Hye-ri.

"Reboot the system."

We need an authorization code.

-We need to solve the puzzle. -Let's go.

-It's the same access level. -Right.

-That's Level R. -Okay.

-Level S is for something else. -Got it.

I'll check this place out a bit more.

-You guys go ahead. -Go for it.

-I'll stay with you. -Okay.

-My cellmate. -Yeah, we're the Wagon Brothers.

-Yes, the Wagon Brothers. -Exactly.

November of 2023...

What?

A QUICK GUIDE TO LIFE ON THE SUBMARINE

Are we on a nuclear submarine?

Yeah, didn't you see the radioactive signs earlier?

We have to go up there, don't we?

The fact that the vent was left open

could only mean that it was a path of some sort,

whether it be for us to use or for something else.

Either way, it had to lead somewhere.

That's got to be it, right?

-Or do we close it? -I hate this.

Do we really need to get in there?

I think so.

Okay.

The first letter was A.

Let's keep going.

-It starts with this dot. -Okay.

Could you call it out?

-Dot. -How can you tell?

-Short dash. -Short dash.

-Dot. -Dot.

-Long dash. -Long dash.

-Which is which? -Space.

-And then a long dash. -That's it, right?

They're in sets of five.

We just have to find it now.

-It must be Q. -Right.

AQ.

-And then it's long dash. -Long dash.

Space.

-Dot. -Dot.

-Short dash. -Short dash.

-Dot and then long dash. -Dot.

That's U.

-It's probably "aqua." -And then a long dash.

-Long dash. Dot. -Dot.

-Short dash. -Short dash.

-Space. -Space and then dot.

-Long dash. -Long dash.

-"Aqua." -You were right.

-Next. -Dot.

Dot.

-Long dash. -Long dash.

-Space. -Space.

-Short dash. -Short dash.

-Dot, long dash. -Dot.

It's the number two.

You're right.

Next, two long dashes,

dot, short dash, and dot.

-I'm confusing myself. -There it is. It's M.

-Long dash... -I'm not sure about the "2M" part.

But that's gotta be it, right?

-Let's move on for now. -Okay.

Where were we?

-Long dash. -Long dash.

-Dot. -Dot.

-Short dash. -Short dash.

-Space. -Space.

-Dot, then long dash. -Dot.

That's A.

-Dot. -Then short dash.

-Short dash. -Long dash.

-Dot, space, and then long dash. -Dot. Long dash.

That's N.

-It's AQUA2MAN. -AQUA2MAN?

Are we sure about the two?

-This must be it. -Should we try it?

AQUA2MAN.

-Good. -Great job.

Well done.

There's a video.

"Research Journal."

UML-01 RESEARCH JOURNAL

They're researching deep sea creatures.

"Project name, 'Undiscovered Marine Life-form.'"

"UML-01."

The participants are Sim Hye-sung, Ji Young-koo, and Ahn Joo-hyoung.

Their goal is to secure UML-01 and examine its characteristics.

-"Sample an unidentified creature." -"Sample collection and transportation."

"Sampled an unidentified creature collected 7,500 meters underwater

near the waters of Mindanao."

"Immediately transferred to a sterilized media bottle

and successfully transported to the laboratory incubator."

It's tiny.

-I know. Its body is only 10 mm long. -It's 10 mm long.

And its tentacles are about 4 mm.

It weighs 125 mg.

-It was given the code name UML-01. -It's a tiny creature.

It mainly consumes daphnia pulex, also known as water fleas.

-This is scary. -Here they are.

-Really? -Those are the fleas?

So that's what they fed it.

"Examined the database

to confirm it wasn't a previously discovered life-form."

"Contrary to other known deep sea creatures,

the subject is adaptable to various environments."

"More research is required, but our return was delayed

by the defect that occurred during the docking of the unmanned submarine."

"Research is to be continued in the submarine laboratory

until the repair is complete."

"Movement slowed down significantly after the installation of UV lights."

-So exposure to light slows it down. -Let's remember that.

-We might need a flashlight. -Right.

-We have to take it into the vent. -I agree.

"Subject preys on everything of a size it can handle."

"Always eats the prey's head first."

That's why all the corpses were headless.

-So how big is it now? -I was just wondering that.

-That's what I'm wondering. -Good question.

"Shows increased activity when CO2 levels are high."

We need to get the oxygen level back up.

-Probably. -That's how we weaken it.

Okay, moving on.

-Its growth rate increased. -It got huge.

49 mm.

It only eats heads.

It grew rapidly.

-And then the next day. -December 6th.

Look.

"During the UV lamp replacement process..."

Yes?

So the UV lamp malfunctioned,

and it entered Ahn Joo-hyoung's body through the respiratory tract.

It says that Ahn Joo-hyoung has been in a coma since.

-He's unconscious. -So Ahn Joo-hyoung is still alive.

Is the creature living inside him then?

-So that was... -His bio-signal.

Ahn Joo-hyoung's bio-signal is the last one that they had picked up.

Maybe.

Or maybe he's mutated, just like Hye-ri said.

-Maybe. -Possibly.

"All research was put on an indefinite hold."

-Wait. -Yeah?

All of these entries were written by Ahn Joo-hyoung

until the last one by Ji Young-koo.

-You're right. -You're right.

-Ji Young-koo took his place. -Yeah.

-Is this the last one? -Yeah.

-Let's watch the video. -Okay.

I'm sweating all of a sudden.

This is from December 2nd.

-This creature is special. -Come watch this.

What do you think?

We didn't find any matches in our database.

I'm certain this is a completely new discovery.

Okay, great!

-That must be it. -Let's return to base

and conduct additional analysis.

That must be the creature.

What's the status of our submarine?

There was a problem during the unmanned submarine's docking.

It'll take about a week for the repair to be completed.

-One week? -Yes.

Then we'll have to proceed with the research in here.

What have we found out so far?

As you already know, Dr. Jang...

I mean, Chairman Jang,

only hours after we captured it,

the subject showed remarkable adaptability in the process of its collection

as well as in the incubator.

It's also quite resilient.

It's unlike any other deep sea creature I've seen.

So Dr. Sim, are you telling me

that it can survive outside of the deep sea?

We can't be certain yet.

More research is required.

You should lighten up, sir.

This is our greatest discovery yet.

Yes, Sim. Smile!

Well done, everybody. Great job!

-So this was when it was first discovered. -Yeah.

-When is this from? -Three days later.

-Three days? -It got bigger.

It got so much bigger.

How long have we been in this submarine?

Just a moment.

-We should remember that lock pattern. -It's already been 14 days.

For his phone? Let's rewind.

-I don't remember what the sun looks like. -In case we need it?

Let me rewind.

It's a reverse S.

-You're so observant. -It's already been 14 days.

I'm impressed.

Did they say fourteen days?

-Fourteen days. -Fourteen days?

-Yeah. -He hurt his hand.

-It says he was bitten. -Right.

JI YOUNG-KOO, HAND BITTEN BY UML-01...

I've never seen a specimen grow this rapidly.

Have you measured it?

It was 10 mm the first day,

-and it's 49 mm today. -10 mm.

It got so big.

What did you feed it?

Yesterday, we fed it bee shrimp.

And we started feeding it small fish today.

Interestingly, it only eats its preys' heads.

It's quite chilling to watch.

-Why only the heads? -Starting tomorrow,

feed it frozen mice.

Will do.

-That was from December 5th. -Right.

-Is this one from December 6th? -Yes.

-Joo-hyoung. Ahn Joo-hyoung. -It grew so much.

-Be careful. -It's moving.

Get it done while it's dormant.

Let's hurry.

Hey.

Could you hold this for a moment?

Is this when it entered his body?

Careful.

Stay quiet.

Don't be scared.

AGENTS OF MYSTERY

Joo-hyoung!

Oh no.

-Joo-hyoung. -Hey, Joo-hyoung!

Are you okay?

-Joo-hyoung! -What's going on?

-It went inside his mouth. -What?

Hurry, go get help.

Stay with us, Joo-hyoung!

Come on!

...call everyone to the lab!

Oh no.

-You know what I'm thinking? -So that's what happened.

The monster that's dripping fluids everywhere

has probably taken that researcher's form.

It probably kept growing inside him like a parasite.

What we need right now

is an authorization code.

Is that what we just saw?

Is that the authorization code?

-Is UML-01 the code? -I think so.

-That's the code name. -Yeah.

-UML-01. -UML-01.

We need to reboot the computer using this code.

"Authorization code needed to reboot system."

It's a good thing we found the code.

-How do we reboot it? -Who has the camera?

-We need to reboot the computer. -Okay.

Where's the "off" button?

Important stuff like that is usually right in the middle.

Hey, wait a minute.

What's this?

I opened a drawer beneath the console.

There were several slots, which were empty except one.

When I saw that, I remembered the cards John was carrying around.

Hang on a second.

I think we need to insert the memory cards here.

-Really? -Yes.

-Are there slots for them? -Yes.

-There are a lot of them. -I think we need all of them.

I think he was trying to retrieve these.

-Aren't we supposed to retrieve these? -You're right.

Those are the cards we're supposed to take with us.

Secure the external memory devices

located in the submarine's central computer.

Eight of them?

I think we had eight.

There are so many more slots.

Are there 12 slots?

-Yes, 12. -Right?

Are we supposed to insert the cards?

There are exactly twelve.

We'll just take these with us.

-Yeah. -Or do we put them in here?

I think we should.

Because...

Are those the RAM cards?

-Are they RAM cards? -Yeah.

-He said yes. -We need them to boot up the system.

I'll put them all in.

-Yeah, just like that. -I have to push it firmly.

All right.

Okay.

Is there a certain order we need to insert them?

I don't think so.

I think we just need to get them all in.

All right. They're all in.

Is there a power button?

Try pressing it.

-Is it working? -Yeah, it's booting up.

-It's working. -Guys!

Did it work?

To access the Midas's central computer,

the reboot code is required.

Please state the reboot code.

Was it UMS?

-It's UML-01. -UML-01.

-Say it, Karina. -UML?

-Say it to the computer. -UML-01.

Wasn't it 02?

-It's 01. -Yeah, 01.

-UML-01. -I don't think that's it though.

We need the reboot code right now.

-UML-01 was a code name for the project. -Right.

I think the reboot code is a separate thing.

-Wait. -I got it!

-Is it that? -Right there.

-We saw that. -Exactly.

-I remember the dots. -That's right.

-You're right. -It's here.

I saw the dots and instantly remembered

the letters and tic-tac-toe-like grids

on the back of the Level S card.

We matched the letters according to the shapes.

This is it.

The first letter is N.

-A. -There you go.

T.

U.

R.

-P. -Yes.

-What's this word? -NATURP?

-NATURP? -Yes.

"Naturp"?

It's an E.

One, two, three.

-Nature! -Nature!

PLEASE STATE THE REBOOT CODE TO ACCESS THE CENTRAL COMPUTER

-We must be wrong. -You think so?

-Do we have to type it in? -Hang on.

It said to state it.

-It's "nature." -It should be.

Should we try "jayeon"?

-Say it in Korean. -In Korean?

One, two, three.

-Jayeon! -Jayeon!

I'm getting anxious that we're two hours in.

-We are? -We only have four hours left.

There's not much time.

Can we do this?

-That's more than enough. -You think so?

Trust me.

-Do we say it into something? -Let's try again.

Is there a microphone?

-Should we spell it out? -All the letters?

It's definitely "nature."

-Why won't it work? -Where are we supposed to say it?

-There isn't a microphone around. -A?

-Nature. -P?

What could the code be?

Jeez.

It is "nature."

-Yes, it is. -It's N, A, T, U, R, E.

Why won't it work?

It's the right code.

Reboot code?

It's me, Jo Jong-sun.

Maybe we need to speak into some kind of device.

-Is there a button to press? -Maybe a microphone.

We might have to press a button to speak.

I'm so lost.

That means "nature."

-I guess that isn't it. -Maybe it isn't "nature."

-No, this can't be a coincidence. -I know.

It's just so perfect.

This has to be it.

I don't get it.

Do you see any hints?

Not at all.

It just wouldn't reboot.

We had the code, which was "nature."

Maybe there's something after "nature."

Like "republic"?

That's an example.

-Nature Republic. -Maybe there are more words.

We were completely stuck.

And we were sure we had the right code.

It has to be right.

-Yeah, it's too perfect. -The code is right.

But maybe we need to

-speak into a microphone or something. -Hold on.

What if we need the voices of Jo Jong-sun or the other crew members?

Did they say "nature" in the videos?

-In the videos? -Yes.

Then we'd have their voices saying it.

-That's right. -We can play that back.

-I'll get the laptop. -Let's look for it.

-Let's check. -Karina's got it.

-We might've missed it. -That's true.

Maybe the system recognizes the crew members' voices.

We thought it might be a voice recognition thing.

I don't get it.

-Like a microphone? -Or maybe a walkie-talkie.

What do you think?

We didn't find any matches in our database.

I'm certain this is a completely new discovery.

What's the status of our submarine?

There was a problem during the unmanned submarine's docking.

Great job!

Well done, everyone!

Maybe this isn't it.

If the system would only accept the code

when it's spoken by the crew members,

there would be no point in us saying it.

So we checked to see if anyone said "nature" in the videos,

but we couldn't find a single instance.

Let's keep looking.

-Yeah, we got this. -That's right.

Let's see.

Wait, do you think these valves can be relevant?

-Look. -What is it?

-It says "air" and "water." -"Water" and "air."

I know what these are.

I saw in the manual that these control the submarine's balance.

-There must be something to these. -How did you find them?

Look.

It was right here.

Let's figure out the code first.

-Let's finish this. -Okay.

-What do we do? -Look, there's another one here.

-There's another one here. -Where?

There are more valves here.

Don't these look like the ballast tanks?

These air and water valves keep the submarine horizontal.

-I think I'm right. -If the submarine starts moving,

we'll know what to do.

Nature.

"Please state the reboot code."

But we already did that.

What's the submarine called?

-The Midas. -Hey, Midas!

What if we sat here?

Maybe we have to sit down first.

-Nature. -Two, three.

-Nature. -Nature.

PLEASE STATE THE REBOOT CODE TO ACCESS THE CENTRAL COMPUTER

-Remember the Morse code? -Yes.

Do you think we need to feed it Morse code?

-Maybe. -Could there be a switch?

-We can figure out the code for "nature." -Right.

-But it says to state it. -That's true.

But maybe the system actually communicates through Morse code or a switch.

When we use AI technology,

we say certain words to talk to our phones, right?

Maybe we need to say something to the system

before we state the code.

-Right. -Maybe it has a name.

-Like how we say, "Hi, Bixby"? -Exactly.

Could it really be Morse code?

Is it "nature" in Morse code?

-Is it? -It could be.

You think it could be Morse code?

It could be.

I did write the Morse code down, but there isn't any way to enter it.

Wait, what about this?

That was perfect.

It was 10 mm the first day, and it's 49 mm today.

Are you trying to splice the audio?

I want to see if they mention the AI system's name.

That's a great idea.

There was absolutely nothing that even resembled a microphone,

so I thought that maybe the submarine's AI system

had a name just like Siri or Alexa.

Could you play the first video?

This creature is special.

We didn't find any matches in our database.

I'm certain this is a completely new discovery.

Okay, great!

Let's return to base and conduct additional analysis.

John thinks we need to call the AI first before saying "nature."

-That's his assumption. -That does sound right.

...call everyone to the lab!

Did he just say "beware"?

Beware?

Play that part again.

You hear anything?

Right here.

-Beware? -Behold.

Behalf?

-Behold? Let's listen to it again. -Okay.

-He was calling the AI, right? -He was.

Yes, he told it to bring everyone in.

-Behold? -Behold?

-Behold? -Bold? Behold?

-Like in period pieces. -It means "look here."

-As in, "Behold, I have arrived!" -Let's try that.

Let's try it.

Behold?

-Yong-jin. -Let's try it.

Listen to this.

You can hear the AI system's wake word.

-"Behold"? -Behold.

-No way. -Really?

-Try it. -Behold.

It's worth a try.

I'll act desperate.

"Behold, nature."

Behold!

Did you also say "nature"?

Nature.

Behold, nature!

Incorrect code.

-What? -Please state the reboot code.

-John was right. -Behold?

Behold!

-Behold, nature. -It actually responded to us.

-Exactly. -So "behold" is right.

-It's the right wake word. -But "nature" didn't work.

-I'll try again. -Okay.

Behold, nature.

Incorrect code.

-Try spelling it out. -Please state the reboot code.

Behold.

-Okay! -Rebooting the Midas's central computer.

Conducting system diagnosis and status updates

due to the previous forced shutdown.

-Amazing. -They watched the videos so many times.

Karina was watching them over and over again.

"Behold"?

I was thinking, "Did you really just say that?"

We were kind of joking around, but the AI actually responded.

It took me by surprise.

Lifting the emergency protocol.

Look how bright it is now.

Unlocking the gates on the first and second floors.

We need to get to the second floor.

Unlocking all emergency partitions.

Please don't open them.

-Oxygen generator fully functional. -My heart's racing.

Nuclear reactor and water generator fully functional.

GPS, radar, and security system fully functional.

We did it.

Good job, you two.

-Seriously. -Great job.

-As they say, persistence pays. -I know.

-Behold. -Behold.

Behold, bring us dinner.

The emergency partition on the second floor

cannot be automatically operated until the system diagnosis is complete.

Please use the manual opening mechanism.

-Manually? -Yeah.

Propulsion and communication systems check in progress.

System normalization may take some time.

Please note that errors may occur.

The current oxygen level is within the normal range.

-We did it. -It went up.

We fixed that problem.

So who are the crew members we've found so far?

Jo Jong-sun, Han Hae-joong, and Ji Young-koo.

-They were found dead. -Right.

Jang Man-gyeong will probably have the key.

-That's likely. -Yeah.

We'll need to find him.

-Who did the creature crawl inside? -Ahn Joo-hyoung.

-Ahn Joo-hyoung. -So there's Ahn Joo-hyoung.

-Who's left? -Sim Hye-sung.

-We haven't found him yet. -I remember seeing his lab coat earlier.

So we'll have to find out what happened to them

and secure the memory devices, right?

-Yes. -That's right.

The external drives.

But there's no guarantee they'll be in there.

It does say,

-"Central computer external server." -"Central computer external server."

Are we mistaken?

Behold, where are the external memory cards?

I do not understand your question.

We can ask questions.

Behold.

Are the external memory cards

located in the central computer's external server box?

-Yes. -Okay.

-We need to find Jang Man-gyeong. -He'll have the key.

-He's in charge of this. -Seems that way.

Let's go find Jang Man-gyeong.

Behold, where's Jang Man-gyeong?

I'm sorry, but I cannot answer that question.

Behold, do you know where UML-01 is right now?

I'm not sure.

Could I be of assistance in another way?

I want to know where we can find UV lamps.

If the monster shows up, we could slow it down with UV lamps.

Behold, where are the UV lamps?

What an interesting question.

However, I cannot answer that.

-Why not? -Why not?

-Why not? -Are you asking it why?

Behold, where does the vent in the cockpit lead to?

I don't have the answer to everything.

-Attitude. -I think she's mad.

-She's in a bad mood. -She's got attitude.

Behold.

How many survivors are in the Midas?

I do not understand your question.

How many survivors are there?

What are some things we could make it do?

Let's think about it.

Maybe the AI could protect us in some way.

That would be helpful for us to know.

We don't know what could happen with that monster skulking around.

Could we tell it to close the doors?

-Using the AI? -Behold.

-Yes? -Close the cockpit door.

Please use a more specific term.

-But it's called the cockpit. -Try something else.

Maybe it's the cockpit gate?

-Behold. -Gate?

Close the cockpit gate.

-Emergency partition? -Please use a more specific term.

Emergency partition?

-Behold. -Yes?

Close the emergency partition leading to the cockpit.

-That worked. -In that case,

we can make it close the door if the monster comes after us.

-That's right. -Right.

We'd have to remember the correct term.

-Emergency partition. -Emergency partition.

-Do we have to memorize that? -Is this the cockpit?

Memorize the room names.

This is the cockpit.

Will we be able to remember all of this?

-In such an emergency? -Exactly.

What if we end up saying, "Just close the darn door!"

Behold, open the cockpit's emergency partition.

-Where are you going? -He's checking something.

We'll see if it can hear him.

Behold, can you hear me?

I don't think it can.

Behold, close the cockpit's emergency partition.

Okay, I think I got it.

Behold!

Behold!

Try the command from there.

Behold.

It can't hear him.

Behold, open the cockpit's emergency partition.

-Okay. -We have to be inside.

Inside the cockpit?

I'll try it from here.

Behold, can you hear me?

It can't hear you.

-So we have to be in there. -That's right.

-All right. -How is this helpful?

Exactly.

At least we'll be able to run here.

-If anything happens, run over. -Yeah.

We can talk to the AI.

Basically, this place is our evacuation shelter.

What do we do about that?

I'm worried something might pop out of there.

Here's what I think.

-We're going to the second floor, right? -Yeah.

This could be our escape route.

Although it may be a bit dangerous.

The creature moved around up there through the vents.

Something's up there.

It's moving around up there.

We should close it for now.

-I agree. -Should we?

We probably should.

I'm so scared.

-Will it stay closed? -Take a look at it.

-Can you close it? -It seems that way.

-There's a latch. -Lock it.

-Good. -Let's keep it closed.

Should we go up?

-My heart's racing. -Are we ready?

-Are you guys ready? -Is this right?

-No. -I'm ready.

-I know I'm not. -Same here.

-Are you nervous? -Yes.

-Behold. -Yes?

Play "Female President" by Girl's Day.

-I'm sorry, but I cannot do that. -Well, that's a shame.

-You still got it. -You don't seem nervous anymore.

Work it, girl.

-Let's go. -Let's go.

-I'm terrified. -Me too.

It's so fun to talk to the AI.

-"Behold!" -"Behold."

Who would've thought that it'd be "behold"?

Will you be okay, Hye-ri?

-I'll be brave for everyone. -Okay.

Why is this so scary to me?

-The gaps between the steps are wide. -Yes, it's understandable.

-Watch your step. -Okay.

-Be careful. -Will do.

I feel so dizzy from the climb.

We all need to stay alert.

-We need to watch out for ourselves. -True.

-Yes, ma'am. -The monster could be in here.

It really could.

Since the monster might be in there,

-Karina should open the door. -Great idea.

-I don't mind. -Go ahead.

-I'm so scared. -Turn your back to the door.

Yeah, just like that.

We have to be quiet.

-This is the cafeteria. -Cafeteria?

What is it?

-There's someone here. -Someone there?

Another one.

This is horrible.

Another body?

This is horrible.

Another body?

That's so gruesome.

I don't like this.

Check his phone.

That must be it.

This is Sim Hye-sung.

-We have to unlock it. -Sim Hye-sung.

You remember the pattern?

-It was in the video. -Was it a reverse S?

Yeah, or a five.

We should remember that lock pattern.

-It's like this. -It's a five, right?

-Good. -Okay.

Gallery.

-There's a video. -What is it?

DECEMBER 10TH

-Please. -This is terrifying.

-December 10th. -It was taken on December 10th.

Due to UML-01's attacks,

Ji Young-koo, the head researcher, is dead.

And I'm not sure

whether Jang Man-gyeong, Jo Jong-sun, and Han Hae-joong are still alive.

It's been five days since the creature has entered Ahn Joo-hyoung's body

and taken him as a host,

making him unable to communicate.

He has lost his human form

and turned into a monster.

If anyone...

If anyone sees this video,

you must know what happened in the Midas.

All of this happened

because of Jang Man-gyeong's greed.

Jang Man-gyeong's greed?

He must've been in here.

It looks like a human.

But it's pitch black.

It grew inside him, didn't it?

He's a total monster now.

I have a bad feeling about this.

We found a recorder.

Something feels off about Jang Man-gyeong.

I refuse to take part in such a dangerous project.

Developing living weapons?

Jang Man-gyeong was trying to develop living weapons.

The creature fused with a human, so it became more like a human.

This all happened because of Jang Man-gyeong's greed.

-It obviously needs to be opened. -Wait.

Are those shoelaces?

Then the monster could really be in the vents.

That was so scary.

There's a lock here.

Isn't it suspicious?

If the key is hidden somewhere, where could it be?

-Hey! -Behold!

Hurry!

Submarine tilting detected.

Subtitle translation by: Ji-hun Lee