Original subtitles

[ thunder crashing ]

Lisa: Takes everything out of me.

Coldest night ever.

Lisa: I don't think I'm gonna make it.

Tom: This is -- it's for real.

Like, our lives could seriously be in jeopardy.

Narrator: In the world's harshest environments,

two experienced survivalists

put their skills to the ultimate test...

[ crying ]

aah!

...Without food, water, or clothes.

I'm really cold.

Rain's coming down like crazy.

Narrator: Now, high in the rain-soaked cloud forest

of argentina

two strangers must work together

to survive in the extreme cold for 21 days...

Tom: It's really just bone chilling right now.

Hey, "naked and afraid." it's tom mcelroy.

I -- this is my diary camera,

getting ready for heading out to argentina.

My name's lisa coray,

and this is the morning that I leave.

Feels like it's already about 70 degrees

out here in california.

I have no idea

what the temperature's gonna be in argentina.

Love the winter.

Narrator: Along the 34th parallel in south america,

argentina's cloud-covered mountain jungles

are being pummeled by a massive storm front.

16 inches of rain, twice the monthly average,

have fallen in the last three days,

causing deadly flash floods, a 10-degree drop in temperature,

and the wettest, coldest conditions

in "naked and afraid" history.

Fully aware of the heightened risk,

both survivalists have agreed to proceed with the challenge

as planned.

[ thunder rumbling ]

tom: It is raining, it's wet, everything is soaked.

It's gonna be a long, long day.

I'm a wilderness survival instructor.

Having taught survival for the past 20 years,

I've got a large bag of tricks.

I've taught everything from bows and arrows

to basket making, pottery.

Being somebody that likes to run off into the woods

also lends itself to being a loner.

There's definitely times I get impatient with people.

Looking at these conditions of cold and wet,

I'm concerned my partner's gonna tap out in the first hour

and I'm gonna be alone for 21 days.

All right, day 1 of the 21-day survival experience,

and it is pissing down rain.

I am a pediatrician.

I enjoy working with people,

and I have been studying survival

for the last several years.

I love minimalist camping,

building shelters, building fires.

I've also spent a lot of time

working in an emergency department,

so I understand how to get things done

when I'm under stress.

I hope that my partner isn't a micromanager

because that's kind of one of my pet peeves.

Here we go.

After everything I was thinking about,

this is the worst-case scenario I was planning for.

It's cold, it's wet, it's pouring rain.

This is gonna be rough.

Lisa: The nakedness -- "ooh, I'm naked,"

meeting somebody I've never met before,"

it's gonna be odd.

I hope that my survival partner's a nice person,

I hope that they have a sense of humor,

and I hope that we get along together.

All right, here we go.

Nice to meet you.

Great to meet you, too. Tom.

Lisa.

So, this is awkward, huh? Yes.

[ both laugh ] yes, it is.

Nice outfit. Thanks.

I got mine at the gap.

[ laughs ]

but anyway...

Uh, yeah.

Narrator: Lisa and tom are allowed two basic survival items

and will be documented by a small crew

who will only intervene in case of a medical emergency.

I have the map.

Let's check this out.

Tom and lisa have been dropped off

on the eastern side of the andes mountains

at an elevation of 4,000 feet

and a temperature of 63 degrees --

the highest and coldest insertion point

of any previous survivalist.

Being wet and naked at this altitude

drops core body temperature by several degrees

and severely increases the threat of hypothermia,

and food sources will be scarce

as animals such as wild turkeys, poisonous toads,

and deadly pit vipers

also have to protect themselves from the cold conditions.

Let's check it out. Sounds good.

Tom: So, you're from new England?

Yeah, currently. I live in massachusetts.

Cool. Where are you from?

Santa cruz, california.

What do you do in santa cruz?

I teach survival. Oh, you do?

Yeah. Cool.

How about you?

I'm a pediatrician.

Oh, wow. That's awesome.

That's cool.

Lisa: Tom seems like a really nice guy.

He seems like he has a lot of experience at this.

I definitely appreciate having somebody who's done this a lot.

So, I'm not super cold right now.

Are you doing all right?

Um...I'm doing okay.

It's definitely pretty cold out right now.

Yeah.

Tom: I'm already getting pretty cold,

so we're gonna have to really get on it

and build a shelter and a fire.

Looks like a nice opening up there would be nice.

It's high up above the river.

Honestly, like, I don't know if it's getting any better.

Lisa: If we can -- let's spend a little time

trying to find a better path.

If we can find a better path, cool.

If we can post up here,

I'll feel a little bit better about it.

Lisa: I think it's entirely likely

that tom's the one used to being the one in charge,

the one running things.

Sound good? That's cool.

Cool.

Funny thing is I'm used to being the one in charge

and the one running things,

so it's gonna be an interesting pairing.

So, thoughts on shelter?

What kind of structure do you think you want to build?

Well, I usually talk about a-frames

or, like, lean-tos, but...

Um, okay.

It's a hard one 'cause I kind of disagree.

So, I'm not sure how to handle that.

Lisa: What is your disagreement with that?

I think for now, the day's getting late,

so if you're cool with it, build, like, a small wikiup.

We'll run up here and see if --

seems like there's some decent stuff up there for straight poles.

We need every minute that we can get.

Hopefully when we're warm and dry tonight,

we can really hash out our teamwork

and how things are gonna go.

Right now, it's just the pressure of day 1

to get some stuff done.

[ thunder rumbles ]

takes a long time to make a good shelter,

and generally, when I go in a situation like this,

from the second I start the first day

until it's too dark to see, I work on my shelter,

even if I think it's overkill.

Hey, tom? If you want to take a break doing that

and let me do it for a little bit.

I don't want you to get, like, super crazy tired.

No, I'm good.

All right.

[ grunting ]

aah!

Tom: I was whacking away at a log,

and it just kind of deflected, nailed my wrist,

and gave me a pretty good gash on the arm there.

It's a deep enough gash

that it's gonna need something to keep it closed.

In this environment, if I get a ton of dirt in there,

bad water in there, it's gonna get infected.

Come on. Let's go wash it out.

I've seen bigger guys than you pass out.

Lisa's a doctor, and she tried to help.

Thing is, I know what it's like

to be on a first-day survival situation.

You really just need to go into this animalistic mode

where you just go, go, go.

Lisa: Not 10 minutes after I suggested

that tom maybe take a break with the machete,

he cuts himself.

And then he keeps on working while he's bleeding,

so I'm frustrated because he's not listening to me,

and that's just the way it is.

[ thunder rumbling ]

tom: It's freezing cold.

Do we really need a fire right now?

From my experience,

I can definitely make a fire that's gonna last,

you know, at least a solid half an hour.

Narrator: Tom's friction fire skills

will not work in these wet conditions,

making lisa's fire starter an invaluable tool.

I'd really rather not do the mad scramble for firewood.

Uh-huh.

Lisa: Tom wants to make a fire.

I agree that we absolutely are gonna need fire,

but without having our shelter ready

and without having had time to collect firewood,

starting a fire right now, if it doesn't last the night,

then I don't think we should necessarily

be spending this energy on it right now.

I don't think that's a good idea.

Keep in mind, we don't have a whole lot of wood,

and it's getting dark.

Tom: There's certain things I feel strongly about.

Obviously, I have

more wilderness survival training and background,

and so there's some things

I'm just gonna completely disagree with.

Everything is soaked through. It just does not want to light.

If we don't get a fire tonight, it's gonna be rough.

If we don't get a fire and it rains tonight,

this is -- it's for real.

Like, our lives could seriously be in jeopardy.

Oh, god.

Never seen anything like this.

Never, ever.

[ inhales, exhales deeply ]

wow.

Okay, it's go time.

Lisa: Obviously, having a fire

is gonna be really important for us,

but not having our shelter done could kill us.

Tom: Last night was rough.

Basically just shivering to keep myself warm all night.

Lisa: We're at 5,000 feet.

We're in a cloud forest in argentina,

and it's wet here, it's chilly here.

I would say the temperatures last night

got probably into the 50s.

We still don't work fantastically well

as a team together.

I'm going for a walk.

All right.

I've been frustrated when trying to work with tom

because he likes to do things

the way that he likes to do things,

and sometimes less of a collaboration.

Narrator: The unprecedented conditions of argentina

are already putting tom and lisa's patience and skills

to the ultimate test.

Before arriving,

a team of primitive survival and special forces experts

assessed lisa and tom's skills, experience, and mental fortitude

and assigned them each

a primitive survival rating, or psr.

With 20 years as a survivalist instructor,

tom was given a very high initial score of 8.4,

squarely in the expert range.

But his frantic pace and reluctance to work as a team

have already started to lower his score.

Lisa possesses a solid stable of basic skills

combined with high intelligence and team-building abilities.

She scored in the intermediate range with a 6.8,

and that number has thus far remained steady.

They'll receive a final psr evaluation

at the end of the 21-day challenge if they make it.

Lisa: I could...If I so desired,

make this a real kind of battle of the sexes thing.

Anything you can do, I can do better.

There's no point in that.

Do I have any doubt

that I could do this even if I didn't have tom?

Not really.

I think I could do this.

It's just been kind of a funny realization to have.

Tom: The biggest challenge that's just gonna be constant

this entire time we're here is the cold.

And that's huge because it never lets up.

Decided after a cold night

to build up rocks in the front of the shelter

and to try to close off

as much of the front of the shelter as possible.

Hopefully, that's gonna just throw heat into the shelter

and not just have it go up and out.

Until I'm confident that that shelter is waterproof,

there isn't much point in moving on to anything else.

Last night, tom was really cold and really frustrated.

And so, I brainstorm.

How about if we just make a wall?

He was like, "oh, I don't know. I'll think about it."

in the morning, I came back and he was building the wall.

And I felt like I had a good idea,

and there was no acknowledgement that it was a good idea

until he decided that he was gonna make the wall,

and I would've helped. I wanted to help.

Yeah.

Top end's looking better.

The bottom's looking a little shy,

but we can always --

we can always add more.

In situations where I've had disagreements

with people that I was working with,

my m.O. Is usually to say, "you know what?

I can take it."

we're gonna be here for another 18 days together,

and I want and need a partner that'll work with me.

If we are going to make it,

tom and I going to have to figure out how to work together.

I totally understand that as you get cranky and hungry,

stressful situations happen

and team dynamic starts to break down.

The thing is, I know that the second the sun drops,

things get miserable

if you haven't prepared yourself enough.

I'm a little nervous

that there is possibly thunder on the horizon.

Our shelter's just not ready for that.

Things are looking a little ominous out there.

I hope it's just a scare.

Narrator: High above the jungle,

another massive front of cold mountain air

is on a collision course

with the warmer jet stream of valley air below.

It's thundering out like crazy.

Just starting to rain.

And I'm definitely nervous that, you know,

there's already drops going on in our shelter.

[ thunder crashes ]

we got the fire going,

but honestly, I'm not feeling too much heat off of it,

and the rain is really coming down.

Tom? How exhausted are you feeling?

Just hitting a low. I'm okay.

I'm getting kind of concerned

and maybe a little bit worried.

I just need a rest.

Tom: Last night was hard.

[ chuckles ]

a lot of suffering, a lot of shivering.

We need to find a way to stay warm.

That's our number-one priority at this point.

Lisa: Tom lives in santa cruz, california,

which is a lovely, lovely place

where it is 75 degrees year-round,

which I think has a big effect

on his ability to handle the cold.

I live in boston, massachusetts, and for the last two weeks,

being aware that I was coming someplace that was kind of cold,

I've kept the heat in my house at 50 degrees.

I'm hanging out in a tank top and shorts in my house,

which is currently 54 degrees.

I think that I'm probably a little better equipped.

He seems like he's really struggling with the cold.

Narrator: Over the next four days,

seven more inches of rain drench the jungle,

and temperatures hover in the mid 50s.

Tom's constant shivering is burning essential calories

that he is unable to replace, making him ever weaker.

Tom is sounding very kind of despondent,

and, um...

I really hope he doesn't tap.

Tom: If it gets colder

and things don't improve from what we have right now,

with the level I'm at, I'm near hypothermic,

and if it gets worse,

it's just not gonna be physically possible

to stay here.

I don't really want to contemplate

going through this alone.

It's true that I ask myself the same questions that he does,

but he's cold,

and he's saying that he's not sure that he can do this,

be cold like this for long.

[ sighs ]

we can get through it.

Tom. Hey.

How you doing?

I'm good. I'm just, uh...

You know, just feels good to lay down for a second.

You got to slow down, buddy.

I wish I had packed on more pounds

before coming out here, for sure.

By day 21, I'm gonna be -- I'm gonna be pretty emaciated.

Lisa: As a doctor,

I've been taught to put emotion aside

and also to be very patient.

"no, it's okay."

tom and I have had some differences since day 1,

but I think right now

the important thing is to be there for him.

Narrator: A brief pause from the rain

gives lisa the opportunity to dig for food

that is more exposed with warmer weather.

All I know is they like rotted wood,

so I figured I'd come break open some rotted wood

and see if I could find any grubs in there.

We were kind of hoping that we were gonna find snakes,

frogs, birds, something decent-sized.

But because of all the cold and the rain,

our options for food are pretty much limited to grubs and worms.

But that's okay. It's better than nothing.

They're not very exciting, but we just need the calories.

I got something for you. I got a fatty grub.

No way.

I also caught a whole bunch of worms,

so I was gonna cook them up, but --

cool. Yeah.

Getting the worm thing, I think, is gonna be a great idea.

Here you go. Thank you so much.

I've actually got three more, but the other ones are teeny,

and I've got like 10 worms.

Yeah, I think this is gonna be our go-to food supply

for a while now.

Want to try this one?

Narrator: The small but welcome meal of grubs and worms

has provided the survivalists with about 120 calories

and 11 grams of protein each --

the equivalent of two medium-sized eggs.

That's so good.

I'm really grateful for lisa providing me with calories.

Mmm.

Their relief, however, is short-lived,

as another massive storm races toward them as night falls.

[ thunder crashes ]

so, tomorrow is bark shingle day.

It's about the only material that we have

that's realistically actually gonna be waterproof

over a long period of time.

No more messing around. No more messing around.

[ thunder rumbles ]

so, I was planning on taking a long-ish hike up the creek.

Just gonna go up that way

until I find more shelter stuff, collect it.

Yeah, I'm gonna -- I'll try to, as I'm walking around today,

maybe find some bark shingle type of stuff.

Lisa: Things with tom,

it just feels a little different this morning.

Not great, not fabulous, but better.

At times, this situation in teamwork

is a little bit difficult,

but we're in a very unique situation.

This is a difficult situation with the cold and rain.

One of the issues that we've been having with our shelter is

that we need to have it covered in case a rainstorm comes in.

The only other solution is to use bark shingles,

which is what's gonna insulate us

and keep us warm and keep the rain out.

Lisa: The sad thing about doing this is

that I'm essentially killing this tree,

but I told the tree that I really needed the bark

so that I could stay warm and dry.

Hopefully, it'll understand.

Tom and lisa are using the bark of the eucalyptus tree

because of its pliability and high oil content,

which makes it more water resistant.

Lisa: The bark will actually keep the water out

and the shingles will let it run off to the sides,

and it won't wilt, it won't weather,

the wind won't blow it away,

and it should keep us dryer better

than the shingling that we already had.

The next time that torrential downpour happens,

we will be dry.

[ sighs ]

tom: Got a turkey right up in the tree there.

I'd love to get him.

Lucky day, turkey.

We cross him again, hopefully I'll get a shot.

The next nine days are gonna be spent focusing on food.

Definitely looking a bit skinny

and concerned about how skinny I'm gonna be

by the time this is done.

And I think my body is starting to say, "we need a real meal."

tom: This is a turning point.

I've been super focused on shelter,

but I need to start looking ahead

and start thinking about food.

So, yeah, trapping is a big thing right now.

I think today what I'd like is making a fish basket trap,

just 'cause that could be very reproducible.

That sounds good.

Lisa: Tom's got a lot of experience.

He's studied way more types of traps than I have.

So, the way the fish trap works is you create this cone.

Fish are gonna enter.

They're gonna enter this kind of cage or trap.

Once they pass through there and they're in the actual trap,

because of some sort of nature of the fish,

they don't swim right back out the middle,

and therefore, people are able to trap fish.

So, you're going up and over one

and then down and around the next

and up and over one and down around the next?

It's not really a weave. I'm just tying them on.

Lisa and I are falling into different roles,

and I think her experience with trapping

is a little bit minimal.

Right now, my strength is in making the fish traps,

making the turkey traps,

to make sure that they are as perfect as possible.

There we go. Got a fish trap.

Looks good, tom.

Narrator: Tom spends days 13 and 14

setting up a variety of traps in the surrounding area,

including a turkey trap.

Tom: Now, when the turkey comes through

and he's pecking at the ground, he's gonna hit this stick,

releasing the toggle,

which is gonna tighten the noose around the turkey's head.

Trapping is an absolute art.

It takes years to get good at trapping.

I've set hundreds of traps.

If you slack on making a trap at all, it's gonna fail.

I'm making it possible for him to do things like make the trap,

which is hopefully gonna feed us.

Lisa: Hey, good job, man.

I really, really, really hope this works.

I really appreciate the work you put in.

Thanks. Me too. Fingers crossed.

[ thunder rumbles ]

tom: Thunder is cracking outside,

the rain is dumping,

and we are huddled in the shelter.

So far...

Significantly better.

Dry-ish.

[ thunder crashes ]

narrator: The storm thrashes the forest

throughout the following day and night.

We're kind of concerned that this might be a long one.

Hit a little bit of a wall today.

Mostly a physical wall.

Tired and hungry.

No fish.

The worms, as I suspected, were either eaten away,

or more likely, the river just washed them away.

So, this trap hasn't been hitting.

I don't see any evidence that the turkey's come by.

You know, with the rain,

I knew that, you know, this is just gonna get pelted

over and over like our shelter was.

That, you know,

that was gonna knock the bait around everywhere.

I pretty much realized last night

that it wasn't gonna be my day for catching a turkey.

How'd it go down there?

Well, the rain and the storms

really kind of messed up our trapping situation.

Holy crap, it's cold up here.

You know, don't make yourself too tired.

The traps haven't really worked, so I'm getting frustrated.

I'm not looking at mother nature as being my furry little friend

that's gonna wrap me in her warm arms and take care of me.

What I need to do is adapt myself

so that I can blend in with my environment.

I'm gonna start dappling myself up with other colors

that would create shadow and blend into the dirt.

All right.

This is one of the areas that I've seen turkey the most,

so at this point,

I just need to stay still, not move,

and let them pass by.

[ turkey gobbles ]

that was the closest I've been to a turkey yet

as I've been out here.

And unfortunately, it's just, you know, it's one spear shot,

and then you got to go back and warm up,

and so it's just been --

it's just a constant challenge out here with the weather.

It's really limiting our ability to survive.

Ugh! I almost had one.

Missed it by like a foot.

Mm-hmm.

Maybe not worth it, but it was a close one.

Lisa: You can't be guaranteed of getting food from hunting.

The traps haven't really worked.

Now that extraction is just three days away,

I'm getting nervous that I won't have the energy to make it.

[ thunder rumbles ]

here comes the downpour.

[ thunder crashes ]

narrator: More torrential rains continue to pound lisa and tom,

confining them to their shelter, unable to search for food.

Conditions are so dangerous

that the production crew cannot reach them for two days.

[ horn honks ]

[ indistinct conversation ]

[ thunder rumbling ]

now on day 20,

their bodies are depleted of energy

as extraction looms ahead.

Lisa: I'm tired.

I'm feeling the effects of hunger.

My body is kind of done.

Tom: Unfortunately, what we're battling

is the fact that we're 20 pounds, 30 pounds less

than we were the first day.

Sounds like we got at least a solid day's hike.

I don't know if we're gonna be able to do it

in one day, though.

No, I mean, considering how much we're both broken down,

I think we should probably plan for two days.

Narrator: In the event of more overnight rain,

lisa and tom construct a crude version

of a native-american sled known as a travois

to transfer shingles for a makeshift shelter.

Tom: Not 100% confident in the travois,

but I hope to god it works,

'cause it would be nice

to not be soaking wet and hypothermic tonight.

Narrator: On the first leg

of their treacherous 10-mile extraction journey,

lisa and tom face an uphill battle,

dragging their makeshift shelter supplies

up and over the steep hills

in hopes of making camp at the halfway point by nightfall.

If they survive the night,

they face another five-mile trek across streams and rivers

in order to arrive at a road

where they'll be extracted by an evac vehicle.

Lisa: That's heavy, you know?

Getting that up over the hill is gonna take a lot.

All right, well, just take as much as you can.

I'll take as much as I can,

and we'll have to figure out the rest as we go.

Oh.

Tom: Getting up the hill without anything right now

at the energy level we have is gonna be hard.

Getting up with an extra 30, 40 pounds of bark strapped to us

is really gonna be hard.

We should get going.

Let's do it.

I just got to take it slow.

Yeah.

This is kind of what I was fearing

is that we're gonna get snagged on everything gets in our way.

Yep.

[ grunts ]

aah!

What? Thorns.

Freaking thorns everywhere, this whole forest.

I swear to god, like half the plants here are made of thorns.

All right. You see the hill up ahead?

Oh, yeah.

That's what we got to do. Oh, god.

Just take a couple steps at a time.

I'm very tired. But this needs to be done.

So I just need to get through it.

[ grunts ]

ow!

[ sighs ]

oh. Aah!

Tom: At this point, we both have cuts in our feet.

We're both exhausted.

It's time to dig in, dig deep,

and find whatever source of energy we can

to get the job done.

[ sighs ] give me a second to breathe.

Oh. Aah!

[ sighs, grunts ]

oh, yeah.

I'm on my way.

Tom: Those are not happy clouds.

[ thunder rumbles ]

we're in a lot of trouble

if we don't get this shelter up before that comes.

Lisa: That took every last ounce of everything I had.

I am wasted.

Tom: We need to get the fire started.

This is definitely a race as I try to get this thing going.

Please, please, please.

Lisa: We need to keep that fire going.

This is not gonna [bleep] do it.

It's so cold. This is not good.

Gonna be near hypothermia the entire time we're out here.

Lisa: I'm really, really tired.

I'm really cold.

Sorry.

We're kind of concerned that this might be a long one.

I'm really cold.

Narrator: It's been 20 days

since lisa and tom climbed into the mountains of argentina,

and their individual primitive survival ratings

are being reevaluated at every step.

Tom's significant level of skill

has proven to be less effective in this extreme environment,

and he has struggled with both the cold

and the concept of teamwork.

While less skilled than her teammate,

lisa has demonstrated great patience

as well as a willingness to put the success of the team

over her own sense of pride.

Their overall performance

will be re-evaluated at the end of the challenge,

and their psrs will be adjusted accordingly.

I'm really cold.

Narrator: The storm rages into the evening,

and temperatures fall into the coldest yet --

the low 40s.

Lisa and tom's bodies are on the verge of hypothermia.

It's so freaking cold right now.

I'm surprised we made it this far.

Definitely concerned about myself and about lisa.

It's really just bone chilling right now.

Hoping that, you know, night doesn't get any colder.

A few hours later,

temperatures drop to their lowest in three weeks.

Got about two or three hours to go, hopefully less.

We don't really know, but things are dismal right now.

I can only hope morning comes soon.

Tom: It's day 21.

Last night was probably the toughest thing I've ever done.

Just sitting there being cold and wanting to tap

and knowing that it's right within reach if I wanted to.

Narrator: To reach their extraction point,

lisa and tom still face a difficult five-mile trek

through thick jungle and overflowing streams.

Lisa: Last night was my breaking point.

I needed a lot of help last night.

Tom was a huge help.

He kept me going, he kept talking to me,

and now we're on to our extraction site.

Watch these thorns to the right here.

Okay.

Just ignore the pain.

Couldn't be doing this without you, tom.

You holding up okay?

Doing all right.

Watch this one. It's thorny as hell.

Okay.

We're doing great.

Ow!

Sounds like the river's right up there.

It's getting louder.

Maybe this is the place.

I think it's gonna have to be.

Oh.

Narrator: The intense rains of the past three weeks

have caused the rivers to swell

and flow at speeds of over 20 miles per hour.

In their weakened condition,

one slip could wash them away downriver.

All right, you up for this?

Yeah, man. Just be real careful.

That's a lot of water moving.

All right, real solid foot placement.

Just be real careful, dude. This is not the time to slip.

If you need me, just yell and I'll reach for you.

All right.

Right behind me?

I'm right behind you. Okay.

Oh, it's cold.

How you doing? You all right?

Staying close behind you.

Yep. Grab a hand.

You okay? Okay.

Got a little push.

Okay, coming up right here. You okay? Stable?

I'm all right so far.

Stay there? Yeah.

Yeah! Nice, lisa. All right.

Whoo! Made it across.

Tom: Oh, there it is. Nice.

Ah, yes! Yes! Whoo!

Tom: For me, being out in the woods

has always been somewhat of a loner activity.

But after everything lisa and I have been through,

we've become such a team

that it seems really nice to, you know, care about

and worry about the other

and make sure that they're gonna be

just as successful as you are.

Yes! Yes! Yes! Yes! Yes! Yes!

Lisa: I think it would take a significant amount of ego

to say that this makes me an expert survivalist.

I still have a lot to learn,

but then when the chips are down,

I am pretty tough.

Oh, we did it!

We did it! We did it! We did it! We did it! We did it!

Let's get out of here! Goodbye, yungas!

Bye, yungas!

I will not miss being cold, but I will miss you.

Oh, thank you so much! Thank you so much!

Narrator: Surviving the unprecedented conditions

in the mountains of argentina

took an exceptional physical and emotional toll

on the survivalists.

Over the course of the wet and frigid 21 days,

tom lost a total of 30 pounds,

while lisa lost 26 pounds.

Tom was slow to realize the benefits of working as a team,

and even with his superior skills,

he struggled mightily with the extreme cold.

Despite having less experience than tom,

lisa's preparations before the challenge

helped her handle the cold,

and she exhibited great mental fortitude

in cultivating a positive working relationship with tom.

As a result, lisa's psr score improves from 6.8 to 7.4,

while tom's drops from an 8.4 to a 7.9.

Lisa: First thing that happened after I got back

was realizing how crazy I smelled.

I smelled very, very strange.

Yes, I know. Yes, I know. Hi.

Wasn't just, like, smelled bad. I smelled different.

It was weird.

Morning. It's day 22, and it's so cold.

Just kidding.

You know, seeing my girlfriend when I got back from the trip

was just, you know, it was amazing.

And it was really good to see her.

♪ naked and afraid ♪

narrator: Despite their scores and differences,

they were still able to overcome

one of the most challenging locations

in "naked and afraid" history,

and prove they have what it takes to survive...

-- Captions by vitac -- www.Vitac.Com

captions paid for by discovery communications