- I'll try over here.

- All right, there's another one down there.

Oh.

[soft dramatic music] ♪ ♪ - [grunts] This looks pretty good right here.

- Is it?

Whoa.

You can go through?

♪ ♪ Oh.

Is it okay to come in?

- Yeah, come on in.

Watch the ice.

It's really slippery around here.

- Oh.

Yeah, that's really slippery.

- Okay?

- Yep.

- All good?

- Yep.

- All right, awesome.

Stepping into a glacier cave for the first time, there's-- there's, like, 8 million different things that are going through your mind.

The first is, like, is this cave going to kill me?

We can actually see light coming through the ceiling over there.

- Oh!

Look at that!

- Yeah, which means the roof is really thin, so we want to be aware of all of that up there, and as we move forward, we wanna make sure that's not gonna collapse in on us.

[soft dramatic music] There's a whole bunch of dirt, but if you look really closely, you can see we've got a crack that's located right here, - Oh, yeah.

I see it.

- And then there's a big gap right in front of us, so I don't actually know what this ice looks like.

- Mm-hmm.

- This rock right here is good and frozen.

- Aha.

- I'm gonna use it as a stepping stone and just jump up to here, where I know that this ice is really good.

♪ ♪ - Oh, holy moly.

- [laughs] Right?

- That's a big hole here.

- Yeah, that'll ruin your whole day if you fall down there.

- Is it okay to jump?

- Yeah, go for it.

- [grunts] - All right, you good?

- Yeah, thanks.

- I've been in caves where the roofs collapsed.

I've fallen through the floor.

I've had walls collapse on me.

I've went swimming unexpectedly.

All kinds of different things that happened to me in glacier caves.

You got that?

Oh, yeah.

Careful, careful, careful.

Now we have, like, all this wisdom that we've accumulated over, you know, almost two decades of experience working inside of these glacier caves.

This is a false floor right here.

What happened is is some meltwater backed up in here.

It re-froze, all right?

It looks like it's probably super thin ice and now it's been covered in dirt.

All right, so I'm going to walk very, very close to the left-hand side... - Okay.

- Right through here so I can see out into this other basin.

- Okay.

- Do not under any circumstances step out here.

- Okay.

I'll be here.

Let me know when I'm coming, okay?

- All right.

♪ ♪ Ang, if you want to come on up.

- Uh-huh.

Ooh.

- You all good?

- Ooh, scary, scary walk.

- [laughs] Yeah.

- Wow.

This is all ice here.

- Right, so... - Oh, look at that!