[MUSIC PLAYING]
BRUCE MEANS: Tepui is a sort of island in the sky.
It's such an extreme place to get to.
RESEARCHER: Dr. Bruce Means is basically on a one-man mission
to look for new species in this unique place in the world
that scientists haven't really explored.
So I called Alex Honnold, the single boldest
climber in the world.
A trip like this, it's something
that I've always wanted to do in my life,
but I think it'll be really scary.
[MUSIC PLAYING]
NARRATOR: Welcome to the Arctic, one
of the harshest and most breathtaking
places in the world.
For this mother polar bear and her cubs,
every day is an adventure.
Somehow, she must teach her cubs how
to live and thrive in one of the world's
most extreme environments.
And if they're lucky, they'll pass
down her secrets of survival to families of their own.
[MUSIC PLAYING]
CLIMBER: We have just come around what
was the hardest, psychologically most challenging part
of the trip into this Eden that you don't even know
exists if you go down the canyon by boat.
The canyon's incredibly beautiful.
There are these grand cathedrals that
are hidden in the fabric of the Grand Canyon
that people don't ever get to see.
Although this place was carved and polished and created
by the river that is flowing along its bottom,
there's a second river.
It's the river that emerges after sunset in the form
of a ribbon of stars.
[MAJESTIC MUSIC PLAYING]
[UPBEAT, TROPICAL MUSIC PLAYING]