PROBABLY WAY LATER THAN WE THINK IT IS RIGHT NOW.

Narrator: AT THIS HIGH NORTHERN LATITUDE, THE SUN RARELY SETS,

BUT TEMPERATURES CAN DROP DRASTICALLY.

Steven: WHEN THE SUN KIND OF HITS THAT HORIZON LINE

BEFORE IT COMES BACK UP,

THE TEMPERATURE DROPS PROBABLY 20 DEGREES SOMETIMES,

SO IT'S DANGEROUS TO BE HERE.

IT MIGHT BE OUR BEST BET TO FIND SOMEWHERE TO HUNKER DOWN.

Steven: YEAH.

THERE'S KIND OF AN OUTCROPPING HERE.

I'M JUST THINKING, IT'S, LIKE, SOUTH-FACING.

THERE'S SOME WINDBREAK WITH THESE WILLOWS.

WE CAN KIND OF CUT THIS OUT...

-YEP. -...TUCK IN A LITTLE BIT.

TUCK IN A LITTLE BIT -- YEAH, LIKE,

IF YOU CUT THESE LOWER BRANCHES...

YEP. YEP.

AND IT'LL GIVE US A LITTLE BIT OF AN OVERHANG.

YEAH.

THIS SPHAGNUM MOSS IS GONNA BE A GREAT INSULATOR

TO KEEP US WARM DURING THE NIGHT.

Narrator: SPHAGNUM MOSS INSULATES

BY TRAPPING MOISTURE AND AIR

WITHIN ITS THICK, FIBROUS LAYERS.

Laura: WE'RE GONNA MAKE A BED

AND THEN USE THIS TO CUSHION IT AND INSULATE US,

AND IF WE HAVE ANY EXTRA,

JUST PACK IT AROUND US TO KEEP OUR HEAT IN.

DUDE, THAT BREEZE. -WOW.

THE SECOND THAT I STOP MOVING, I START GETTING COLD.

-YEAH. -I GET GOOSE BUMPS.

YEP.

Narrator: WITH TEMPERATURES PLUMMETING,

STEVEN AND LAURA ARE AT GREAT RISK OF HYPOTHERMIA,

WHICH IS CAUSED WHEN THE BODY LOSES HEAT FASTER

THAN IT CAN PRODUCE IT.

IF THEIR BODY TEMPERATURE DROPS BELOW 95 DEGREES,

THEIR VITAL ORGANS COULD SHUT DOWN.

THE BREEZE OFF THAT MOUNTAIN -- THAT IS SOMETHING ELSE.

THERE'S WEATHER COMING IN.

[BLEEP]

LOOK AT THAT. JUST LIKE THAT,

WE'RE ON TOP OF THE WORLD, BOTTOM OF THE BARREL.

I KNOW.

Laura: IT IS FREEZING COLD.

DO YOU WANT ME TO START BRINGING THE MOSS OVER,

AND YOU GET THE FIRE GOING?

YEAH. PERFECT.

Laura: THAT WIND -- IT'S COMING IN FAST.

YEP.

I FIGURE WE GET IT STARTED HERE

JUST 'CAUSE WE'VE GOT A NICE LITTLE COVER GOING.

♪♪

♪♪

BURN OUR SHELTER DOWN.

I, LIKE, JUST STARTED THE TUNDRA ON FIRE.

-DO YOU NEED HELP? -YEAH, I DO.

OH, MY GOD.

[BLEEP] GET SOME SNOW.

HOLY [BLEEP].

♪♪

HOLY [BLEEP].

ALL RIGHT.

WE'RE GONNA NEED TO WATCH THIS.

THIS IS FLAMMABLE.

OUR BEDDING IS LITERALLY A BED OF TINDER.

YEAH. IF THE HIDES BURN...

YEAH. WE'RE -- IT'S OVER. IT'S GAME OVER.

NOT WORTH THE RISK, FOR SURE.

WE MIGHT JUST HAVE TO USE THAT MOOSE HIDE TONIGHT.

YEAH. I KNOW.

Laura: WE DON'T HAVE A FIRE.

IT IS DEFINITELY WORST-CASE SCENARIO.

♪♪