Original subtitles

‐ Narrator: ..."Lost Gold of World War II"...

‐ Holy.

We got a major cave‐in.

If we can't get around this collapse,

then we'll never get inside the mountain

to get this treasure.

‐ "X" marks the spot.

‐ Knowing that there is a void space

deep down underneath the waterfall,

and knowing satellite has confirmed

a big metal target there,

this drill's our best bet to get there.

‐ I got some incredible news for you.

I just found Chuck McDougald.

He has about 20 Yamashita treasure maps.

‐ Keep it coming.

‐ Narrator: John Casey and Rick Hurt

are back in the Philippines

with a new team,

continuing their search for Yamashita's gold.

‐ We're gonna find a way to get to this treasure.

‐ Like many others, John believes

Japanese general Tomoyuki Yamashita

took billions of dollars in treasure

looted by Japan during World War II,

and buried it in the Philippines,

including somewhere in this mountain.

Following a series of mysterious symbols

they believe were left by Yamashita,

the team is investigating three sites‐‐

a waterfall...

‐ John: This waterfall is hiding something.

‐ ...a crater known as Breach 6...

‐ I've never seen anything like this.

‐ ...and a camouflaged tunnel they uncovered last year.

‐ We are in the mountain, boys!

‐ Can they finally discover the...

Inside the tunnel,

miners Levi and Geo are clearing a massive collapse.

‐ This is a mess.

This thing's caved in as far as I can see.

I'll tell you, you run into something like this,

it's never easy to get through it.

I mean, we're looking at a month,

maybe two months of work to get around this thing.

‐ Based on recent discoveries of animal bones

and a World War II‐era Japanese landmine,

the team wants to continue exploration.

‐ Boy, that's some very unstable ground.

‐ But this dangerous mess

is stopping them dead in their tracks.

‐ Let's do it.

Do you hear the ground taking weight?

Listen.

I mean, you can see right there.

‐ Yeah.

‐ That there‐‐ that's the danger zone, man.

‐ Yeah.

‐ I've dealt with collapses like this in the past,

and messing with these things, a lot of times

you're opening a giant can of worms.

We don't know the extent of it.

We don't know how far it goes.

We can't see the top of it.

It's the unknown.

‐ Their only option is to tunnel around the collapse.

But digging through hard rock presents a major challenge.

‐ Hear this?

That's real rock.

‐ Yeah. ‐ Over here...

it's bush.

We want to be into this hard rock.

We don't want to be into this bushy, nasty stuff.

It's nearly impossible to go through this by hand.

It's gonna take way too much time.

With all this hard work we've put in,

all the obstacles we've overcome‐‐

there's been so many different clues

inside this tunnel‐‐

there's a really good chance

that there's treasure at the end of it.

Now we got to make a plan of attack

to go back in there and get around this collapse.

‐ Farther down the mountain at Breach 6,

miners Brent and Farrell continue their excavation,

inching closer to the line of metal deposits

detected by a recent scan.

15 feet deep,

they've already unearthed a solid slab

of manmade concrete

and a 4‐inch‐thick layer of charcoal,

both of which Robert Curtis also found

at his treasure sites nearly 30 years ago.

‐ According to Robert Curtis,

the Japanese were leaving layers

as an indicator to find treasure.

‐ Rick also recently discovered

part of a buried Japanese World War II

military rifle here.

‐ You have a Type 99 Japanese Arisaka rifle.

‐ All signs suggesting

they could be on the right track.

‐ Brent: All the things we've found,

it's like driving me forward

to want to get down to the bottom.

It's encouraging me,

and it's showing me that it's, like,

we're actually on to something here.

I'm not sure what I have here.

Kind of red like clay but...

It's rock‐hard.

Hey, Johnny! ‐ Yeah.

‐ Dude, come on down here for a minute.

‐ Okay.

‐ Not sure what it is, Johnny,

but it's all over down here, dude.

It's really, really hard,

and I can break it with my pipe wrench.

Kind of a stone, but...

‐ Kind of looks like slate or granite.

It's got to be.

‐ It's like a granite countertop.

You're right. That's what it looks like.

‐ I mean, there's three flat sides on that one.

‐ I'm gonna dig a little bit more, dude.

I'll see how much more I can find here.

The stone we just uncovered

kind of looks like a, granite of some kind.

It's got machined edges here and there.

It's broken up.

It's just been straight through.

Like‐‐And it's like a consistent layer

all the way through.

‐ I say we stuff our pockets full of this stuff,

head back to basecamp and show the boys.

‐ Over at the bore hole site...

Rob and drill operator Andrew make slow but steady progress

across the mountain.

‐ We're in about 100 feet.

We've got a ways.

We're looking at a little over 900 feet to our target,

so we're a little over a tenth of the way there.

‐ The horizontal drill is their last option

to reach metal deposits

identified below the waterfall.

‐ Knowing where the treasure is is one thing.

Getting to the treasure is something else.

‐ Since environmental restrictions

prevent them from digging at the waterfall...

they're drilling horizontally

930 feet through the mountain

towards the void space...

so they can feed in a bore hole camera.

‐ There's lots of bore hole cameras

that will make it 930 feet

to see exactly what we've hit.

‐ For the 3‐inch drill to hit the void space

from 930 feet away,

it must maintain pinpoint accuracy.

‐ I'm getting more and more anxious

because as we move further in,

our ability to make a correction

starts to shrink down by a lot.

‐ If the drill is knocked off course

by even a fraction of a degree,

it could miss the void entirely

by the time it reaches target depth.

They need to constantly monitor core soil samples

taken by the drill

to ensure the bore hasn't shifted.

If the samples stay the same,

they know they are on the right directional track

for the void.

‐ We're about to pull

about another 4 1/2 feet of the core sample.

I'm just keeping my fingers crossed

that it's that exact consistent type of rock

that we know is gonna keep us on a straight path.

‐ What are we looking at, Andrew?

Yeah, it's like decomposed.

‐ So now that I see this, it's a little bit concerning.

‐ But things like this might be a little bit of an issue.

‐ They also need to monitor any changes

that could jeopardize the expensive machinery.

‐ Just got to keep an eye on this.

Rob's certainly been under a lot of pressure here,

you know. This is a longshot by far, you know.

When you got to drill 900 feet

with a little 3‐inch drill

to a little spot maybe 20 by 20,

you know, underneath the waterfall,

it's a‐‐ it's a hell of a task.

I mean, we're not that far in yet.

We're only about 100 feet,

but, with 800 feet to go, anything could happen.

Seeing that, Rob?

Helicopter coming in.

Rick, you seeing that helicopter?

We just got buzzed.

‐ It's a little disconcerting.

I was trying to get my, phone camera on it

to zoom in and see if I could get numbers,

but I...

‐ Copy.

Yeah, I see it right there.

‐ There's two of them.

There's another one behind it.

It's the first time

they've spotted aerial surveillance

in the two years they've worked there.

‐ We've been warned about being watched by somebody.

‐ The team's new partner,

experienced treasure hunter Chuck McDougald,

also warned them.

‐ There are people

that are gonna observe everything you do,

and if and when they think you've found a treasure,

they might step in

and, either steal it from you

or just kill you right then and there.

‐ Rick: I'm just wondering if they just came in

for a quick check on our progress.

‐ Copy that.

All right. Just keep an eye open,

and, you know, it's just‐‐

it's just another damn thing to worry about.

If you're going after a treasure like this,

chances are somebody's watching.

‐ At the tunnel,

father and son miners Geo and Levi

bring in a remote controlled demolition robot

to help dig around the collapse.

‐ Hopefully this thing here will be our saving grace

and it'll make stuff go a lot faster.

It's like a mama excavator packing its little baby,

packing it back to its nest.

‐ This is it? ‐ That's it.

‐ You know, it's the same color as a lemon, right?

‐ 'Cause I was gonna say

you want to keep shoveling? I can take it back.

‐ But I got to see it to believe it.

I don't know. ‐ Well, you can go in there

and pickax it. ‐ It's a little small, though,

though, isn't it?

‐ Hey, man, dynamite comes in small packages.

‐ Okay.

‐ Remote controlled demolition robots

are often used in the mining industry,

where it is unsafe or inefficient

to work by hand.

They're equipped with multiple attachments,

ranging from cutters to claws,

but their primary tool

is a hydraulic hammer‐chisel

that can strike with up to 2,320 pounds

per square inch of pressure.

At a rate of 608 strikes per minute,

this machine gets the job done

in a fraction of the time it would take

to shovel out the debris by hand.

‐ The only way that we're gonna know what's inside the tunnel

is to get past the big, massive cave‐in

and‐‐and find out where this thing goes.

‐ I'm gonna drop the down riggers now.

Moment of truth. Are you ready?

‐ I'm way ready. Let's see what this thing can do.

‐ Levi: Chews it up, man.

‐ Definitely breaking rock.

‐ We got a goal, and that goal is to get the gold.

We're not taking no for an answer.

‐ At basecamp,

Rick and John get an update from Bingo.

‐ Bingo.

‐ Morning, guys. How you all doing?

‐ John: We're doing good.

‐ Narrator: While searching

for Yamashita treasure maps,

Bingo was introduced

to an associate of the late Robert Curtis.

‐ Brian Greenspun: Chuck McDougald.

He's one of those experts

on this whole Yamashita gold story.

‐ While meeting with McDougald,

Bingo got his hands on treasure maps

Chuck obtained from the office

of former Philippine president Ferdinand Marcos.

‐ These are incredible.

I've never seen anything like this.

‐ Yeah. ‐ In any of my research.

We're literally holding pieces of history right here

if he did in fact recover this treasure.

‐ After negotiating a deal...

‐ I think, if treasure is found,

I would share in that.

‐ If that's what it takes, then let's do it.

‐ ...McDougald agreed to share the maps,

hoping one of them could be their mountain.

‐ Bingo: I got some great news for you guys.

Check it out.

A Golden Lily treasure map.

‐ Really? ‐ Unbelievable, man.

‐ Is it the real deal? That's great.

‐ I think this one in particular

looks a lot like our mountain.

‐ What makes you think it's a map of our mountain?

‐ There‐‐There's a number of features on here

that made me‐‐ that made me think

it looked like our mountain in particular.

I mean, there's some mountaintops here.

There's a waterway that goes through it,

and there's this‐‐this area in the middle here

that I believe looks like Breach 6.

It's almost like a schematic of what it would look like.

‐ Bingo, I'm starting to see what you're seeing.

You can kind of see, something

that looks like it could be the Pyramid Rock.

I think you're on to something here.

‐ I'm glad you guys are seeing

the same thing I was seeing.

‐ I wonder what all that other stuff means.

I mean, I can't really see a scale on this,

so we got some work to do.

We're gonna have to try to figure out

all the rest of these things.

‐ Thanks again, Bingo.

‐ All right, guys. I'll talk to you soon.

‐ Narrator: John and Rick take a closer look

at the map.

‐ There is so much stuff on this map, man.

‐ Yeah. There's a huge amount of information on here.

Look at this thing. I mean, I would like to know

what the rest of this stuff means,

but the river, really‐‐ ‐ ‐

‐ ...it matches our river in the bends and everything.

‐ Right. I'm super interested in finding out

anything about this area and these shafts.

‐ Yeah. I know. This whole box thing in the center.

I think that's, you know, pretty important.

It's, like, one of the main features‐‐

all these arrows pointing to it.

It's got to have some significance.

‐ There's a couple of things on the map

that really make me believe it's a map of our mountain,

but there's so much stuff on this map

that we don't understand at this point.

‐ What's all this, like, grass up here?

I mean, is it, like, bamboo or something?

‐ I don't know, man.

‐ What do you suppose this clock's all about up here?

‐ Based on my prior knowledge of treasure hunting

and other people I've worked with,

they've told me that this clock face

represents directions, markers,

and the amount of paces you would need to go

to get to that marker.

You know, there's a lot of stuff here,

like all these holes here, whatever this is.

I don't know if this is a cross section of that

or this is a cross section of this.

It's great to have a map,

but there's no scale on this map.

There's no references.

Whether it's our mountain or not,

I just don't know.

So if we want to get to use the map to our advantage,

we're gonna need to figure out

whether this map actually is our mountain.

‐ After discovering an unusual rock layer

in Breach 6,

the team sent geologist Gerard Moulzolf

a piece for analysis.

‐ We sent you that sample.

Were you able to find any information about it?

‐ Yeah, absolutely.

We went through a number of simple geologic tests

to help determine

what minerals and what rock this is.

First thing we did is

we put a little dilute hydrochloric acid,

and it fizzed wildly.

We also utilized the latest technology‐‐

L‐I‐B‐S, or LIBS.

What it does is it actually fires laser beams

down onto the stone, surface of the stone,

and produces a plasma.

And it reads the plasma

and determines what the elements are

and what their relative percentage is.

So we came up with calcium, carbon, and oxygen

and then quite a bit of iron, which is certainly the reason

why this material is so red, confirming a marble.

‐ Red marble? ‐ Red marble, yeah.

I mean, that's the weirdest thing ever,

to find marble in a place like this,

all broke up.

‐ Narrator: While searching for Yamashita's treasure

in the Philippines,

Robert Curtis found marble.

As did Chuck McDougald.

‐ During the, dig at Fort Santiago,

at the 40 meter level, we encountered marble

and gold flecks on our drill‐‐ on our drill bit.

It was already in the maps

that they built the marble fortifications

before bringing in the treasure.

‐ That's amazing.

‐ So, John, what's really interesting about this

is it is not native to the Philippines.

‐ That's incredible.

‐ This nodular texture

that we see here,

it is almost as unique as a fingerprint.

We've got some white calcite vein here.

This is all highly special.

‐

‐ So I actually tracked down the exact quarry

that this came from.

This is actually French marble.

‐ Wow. I wasn't expecting you to say that.

‐ France.

‐ And what's so unique about this

is this particular quarry has been known

to have been mined since the first century BC

by the Romans.

‐ Holy smokes.

‐ And King Louis XIV used this quite regularly

in the palace at Versailles.

So this is a very famous marble.

This was the king's quarry.

‐ Narrator: This red marble famous originates

in a quarry in southern France.

It's possible Japanese forces looted it

when they conquered French colonies in Asia

during World War II.

But it's also possible

that the marble was seized by Germany

when it occupied France

and then given by the Nazis to their Japanese allies,

including General Yamashita.

In 1940, he spent six months in Germany

on a secret intelligence mission,

even meeting with Adolf Hitler.

The marble's presence here

could suggest one shocking possibility‐‐

a treasure so vast

that the Nazis and Yamashita were cooperating.

‐ How in the world did it ever get

to the bottom of a hole in the Philippines?

‐ We know this is special.

We know this came a long way to get there.

We can only speculate how it got there.

‐ Thank you again.

We do appreciate everything you've done for us.

‐ Any time. ‐ We'll talk to you soon.

Yeah, what's significant

about this marble discovery at Breach 6

is that...certainly not a natural occurrence,

so somebody put this red marble in that hole

for a reason,

and what is the reason?

Does it indicate that we're getting closer?

Does it indicate

that we are on top of a treasure?

The only way we're gonna find out

is to keep going deeper inside that mountain

and see what it is.

‐ Intrigued by the red marble discovery,

John heads over to Breach 6.

‐ Brent and Farrell are digging through multiple layers

as they're going down through Breach 6.

I want to know how did all these layers

end up in our hole.

‐ We've been finding all kinds of random things,

and then we come across this red rock.

It's like a marble.

We're back into, like,

it's like a hard clay type of layer.

It's not really wanting to come out real quick.

An 8x8 hole is a big hole to hand dig.

It's just huge, and it's just wearing on us.

Hopefully we can hit something exciting here

pretty soon.

I'm getting pretty tired of just digging clay.

‐ As the team digs,

they notice the arrival of unanticipated guests‐‐

local inspectors,

like the earlier helicopter flyover.

This kind of unannounced visit is unusual,

and it strikes alarm bells in John.

‐ Normally, if there's an inspection going to occur,

you know, they'll call me up and say "Hey,

"we're coming out to the site today

to give you an inspection."

These guys just showed up out of nowhere.

They said, "We're here. We're gonna inspect the site"

and, you know, were just making sure

that we've got all the right permits,

make sure that the use of heavy equipment

and the people who are around it are doing it safely.

We get frequent scheduled visits from the government

to make sure we're in compliance,

so inspectors showing up just whenever they want

is something we've never had before.

They're kind of looking across at the different sites

with cameras.

You know, it's a little disconcerting.

Yeah, falls is up and over the top.

That's the plan, so hopefully he can get

down underneath the falls so he can‐‐

To work so close to the water.

We're staying totally away from the waterfall.

Makes me a little nervous

because we've got a lot of things going on.

We can only be in one place at one time,

and I can't keep an eye on everything that's going on

at any given moment.

Maybe they think we're getting close.

‐ Narrator: Following up on Bingo's lead,

John and Rick reach out

to their new partner Chuck McDougald,

a contemporary of Robert Curtis

who hunted Yamashita's treasure here in the 1980s.

He's agreed to lend his intel

for a share of whatever they find.

‐ Charles McDougald is a treasure hunter legend

in the Philippines.

He was one of the first people to come here

and work at Fort Santiago with Bob Curtis

trying to recover a treasure there,

and he got really close to recovering that treasure

before the government came in and basically shut him down.

I've been searching for a way into these tunnels,

but the map could really be the key

to us actually getting in there.

Good morning, Chuck. ‐ Nice to meet you, sir.

‐ Same here.

‐ We got the copy of the map that you sent over.

It has really a lot of similarities to our mountain,

especially in an area that we call Breach 6,

and that's pretty intriguing.

We're hoping that you can shed some more light

on some of the other features on this map

and maybe help us line that up

to what we have on the mountain here

so we can actually start building a scale for ourselves

and possibly confirm

that this map is actually to this mountain.

‐ Based on the other maps,

which, you know, very similar wavy lines...

‐ Waterfall‐‐ we've got that waterfall.

Hey, Chuck, you know,

we have waterfalls on our property.

And we've done a lot of work around this waterfall

'cause there are a lot of rock markers there

that indicate that something was going on there,

but there's still no definitive way

to get in there.

‐ Well, if you look at the map,

to me, that upside‐down "U"

could be a tunnel entrance in the water,

and on each side of this trapezoid

is a small ellipse, four of them.

‐ ‐

‐ And those four dark‐colored ellipses,

my theory is that they are access points...

to going to the main tunnel.

‐ Well, in‐‐ in the center of the map,

there's a giant box there with kind of an "X."

It's kind of shaded out,

and then it's got, you know,

four arrows actually pointing to the box.

Do you have any idea what that may indicate?

‐ The 20 or 30 maps I have,

all are very, very similar with these markings.

I don't know for sure,

but the‐‐the‐‐the arrows coming from each side,

my guess is that's an indicator

that that's a very important area.

‐ ‐

‐ Why, we don't know yet.

But there could be treasure in that area.

‐ Wow.

‐ It's hit and miss.

But I will say

you're on the right path.

But again, be careful.

‐ Chuck, I can't even say thank you enough.

You've shed so much light

on something that was a big mystery to us.

‐ Thank you. My pleasure.

‐ Narrator: The next morning,

excavation continues at Breach 6.

After learning the marble they found

originated in a rare quarry in France...

‐ So, guys, this nodular texture

that we see here

is very unique.

‐ ...Rick believes

they could be on the verge

of finally hitting their target.

‐ Ever since we found that marble,

I know that there's something down this shaft.

We hit layer after layer after layer of indicators,

so we think we're gonna hit something significant

very, very soon.

‐ Winch her down for me, bud.

‐ Winch her down here? ‐ Pretty deep.

The plan this morning‐‐

we're gonna get back in the hole.

We're just gonna dig.

We're gonna move muck out of the hole

until we get to the bottom of this thing.

Nothing too cool yet.

Hold that thought.

‐ What did you find?

‐ I think I got a big piece of wood, dude.

‐ For sure.

‐ It's a big one.

I got some timber, I think.

‐ What is it? ‐ Laying down.

‐ My gosh, man.

‐ I just hope it's not, like...

the top of something.

‐ Does it sound hollow at all?

‐ Ooh. ‐ Yeah, that sounds hollow.

‐ It's hollow.

‐ Is he breaking through that?

‐ Dude, I just poked through it with my shovel.

It's really rotten, but there's,

some kind of a void underneath it.

You know, I think I'd feel better

if you guys would throw me a line.

‐ Farrell: Roger.

‐ Got to go really careful from here.

I think we landed right on top of a void space.

So if we can just keep proceeding carefully,

we may be into this tunnel in short order, hopefully.

It would be a good idea, man.

You don't need that bottom dropping out from under you.

‐ You know what? Just give me a little slack on the cable,

and I'll hook up to that.

Give me 2 feet.

I'm harnessing up here

because I don't want to take the chance

and fall into something.

I mean, if it's holding up the whole world,

I could be dropping down

20, 30 feet here if it‐‐ or farther.

‐ This could be it, buddy.

Could be it. I'm hoping it's it.

‐ All right, I'm gonna try to open her up.

‐ Man, I'm shaking inside.

‐ I mean, there's a hole there.

‐ See, that's a... ‐ My gosh.

‐ ...huge piece of wood, man.

Looks like there's probably a cap sitting here.

‐ Keep our fingers crossed, maybe we'll find a hole.

‐ At Breach 6,

Rick and the miners unearth

a promising new layer of material

20 feet below the surface.

‐ My gosh.

‐ A huge piece of wood, man.

‐ Keep our fingers crossed. Maybe we'll find a hole.

‐ Brent, is it hollow underneath of it?

‐ All right. Got it.

So there's got to be more down there, man.

‐ What do we have here?

It's round stock.

So that's round stock, and it's laying down,

which is kind of leading me to believe that it...

that this is completely collapsed.

‐ Hey, Brent.

Yo, I just hit

a big old chunk of round stock.

I'm kind of thinking it's a cap

or a post laid over.

It's laying down completely.

‐ A cap is a broad piece of wood

placed at the top of a vertical post

to increase the surface area it can support.

If this is a cap,

Brent may have found the top of an underground structure.

‐ I'm gonna send you guys up a load

'cause I'm running out of bucket room.

‐ Okay.

‐ We've got some pieces of timbering

from down the bottom of the shaft.

We're gonna see if we can't kind of fit this together

and try and make some sense out of it.

‐ Yeah. That's‐‐I mean, that's definitely a post or cap.

‐ I mean, look at the width on that piece.

And this one looks like it's burnt.

They could have burnt this wood to harden it up.

‐ Preserve it a little bit. ‐ Preserve it a little bit,

make it, last a little longer.

Or they may have blasted this thing shut or...

‐ Burnt it to the ground. ‐ Burned it to the ground.

I don't know what to think at this point.

I'm starting to wonder if this thing

might have been, like, a vault.

What it says to me‐‐

this was constructed to house something,

and whatever it was housing is still in that hole.

So somebody was trying to preserve something

for a long time.

They had something hidden down there.

We've found timber,

but we haven't found any treasure yet.

This could be a tunnel. Could be a room.

But until we get to the bottom, we're just not gonna know.

‐ The next morning, John and Rob set out

to check if some of the indicators

on McDougald's map

line up with locations on the mountain.

‐ We have the Pyramid,

and we have the waterfall site.

So if we can use the drone to find some other markers

that may pertain to other things on this map,

"A," it'll tell us

that this map is possibly our mountain

and "B," those markers that we do find

could correlate to what's on this map

and may lead us to other entrances to their tunnels.

‐ I'm coming up on the river now,

and I believe I'm looking at the waterfall

right in front of me.

‐ Hang over that waterfall for a second.

‐ Let's look at that in correlation

to what we have on the map.

You're on top of our waterfall.

That gives us two points of reference‐‐

Breach 6 and the waterfall.

If that's the case, we should be able to use the river

as a guide to try to figure out those other symbols.

‐ John, looks like the river bends back to the west

and basically heads straight south.

What is that?

‐ Okay.

You know, that's‐‐

that's from the last time we were here.

That's our drill tripod.

‐ Last year,

John and his team drilled at a location

they believed to be a Japanese tunnel entrance

called the Back Door.

‐ I think it's a void.

‐ But as they excavated the area,

all they found was murky water.

Thinking it was a dead end,

the team abandoned the site.

‐ Y‐You know, that's‐‐that's weird

because that's‐‐that lines right up to the map.

Check this out.

You came out of the bend.

Yeah, and you hit it right here,

and that's almost right where the Back Door is,

and on this map is right where this circle is.

According to Chuck,

a circle marker is a tunnel.

I think we should revisit that Back Door.

‐ So far we've got a pretty good perspective

on this whole map,

and everything on that side has lined up.

‐ We know there's a cavity at the Back Door,

and, as much as we tried last year

and couldn't get into it,

I think it's pretty significant

that it lines up to McDougald's map.

Now more than ever, I want to get back down there

and revisit this thing.

I think we walked away too soon,

but now we have the right equipment,

the right testing.

I think it's time to get back down there

and try to get back in there.

‐ Later that day,

Rob checks on the horizontal drill.

‐ We're over 200 feet in at this point.

Everything's going well.

The core samples, they all look really good.

We're really getting back on track.

We're back in the rock we want to be in.

‐ To keep the drill bit lubricated

so it doesn't overheat and break,

water continually cycles in and out of the bore hole.

The water pumping into the bore hole

has disappeared.

Andrew thinks the drill punctured

an unexpected void space,

which the water is now draining into.

But with their waterfall target still 700 feet away,

this hole is a complete mystery.

If the heavy drill bit extends too far

into a cavity unsupported,

it could snap,

particularly if lack of water circulation

overheats the bore.

This kind of damage could keep them

from ever reaching the waterfall.

‐ We're gonna mark out the increments on the rod.

He's gonna push a section through.

We're gonna take a measurement

and see how far across it takes

before we're at something solid.

‐ Well, we've...

‐ What do we do now? What happens if we keep going?

‐ Throughout the mountain,

the team is uncovering incredible clues,

suggesting they could be getting closer to the treasure.

But as excitement grows...

So too does the risk.

‐ You seeing that, bro?

Helicopter coming in.

‐ After receiving several unexpected visitors...

John worries the multiple warnings from Mr. X...

...and their new partner Chuck could be true.

‐ And if and when they think you've found a treasure,

they might step in

and either steal it from you

or just kill you right then and there.

‐ As a result,

John's hired security

to safeguard the perimeters of their work sites.

‐ To protect the site, to protect our people,

you know, it's best to have the right security team on site.

We got security posted

on every high point in this place,

and I think we're good to go.

Treasure hunting in general draws all kinds of people

and mostly unwanted people to your site.

You know, you put all this time and effort

and research into a project

to see fruition,

and they're just gonna wait

for you to do all the hard work

and then just come in guns a‐blazin'

and take it from you.

So anything we can do to avoid that situation

is paramount here.

‐ Over at the tunnel,

father and son miners Geo and Levi

continue to forge ahead with the demolition robot.

‐ Working out here in the Philippines‐‐

definitely different.

It's awesome getting to spend this experience with my dad.

There's not another person I'd rather have here.

‐ Yeah. Knocking big chunks out.

‐ Surrounded by unstable rock,

the pair remain vigilant.

‐ Part of mining, you depend on your partner a lot

because, when you put on that hard hat and that light

and you go underground, anything can happen.

Watch out.

My dad worked in the mines for almost 40 years.

Ended up getting killed in a mine.

So I'm constantly watching my son.

He's constantly watching me.

Working together, I feel way more secure.

‐ Meanwhile, John and Rob set up a bore hole camera

to examine the mysterious void

the drill intersected

200 feet into the mountain.

‐ So now that we know

we've punched into this void space,

we want to send a camera all the way down there

and see what that anomaly is.

That's good.

Keep going.

Not down there.

‐ Looks like that's about the end of it there.

It's getting‐‐ See that dark‐‐

‐ Yeah. What is that dark hole?

Holy smokes.

That's a huge space.

‐ I didn't expect that.

‐ It's starting to look more like a void space

more than it is a fault line, Andrew.

When you guys said you hit something

and lost some water,

I'm figuring you hit a fault line.

See if you can twist it a little bit.

‐ Hang on.

‐ What is that?

‐ What is that?

Let me see if I can get a better look at it.

Right there.

‐ My God.

That is definitely a piece of wood.

That's a timber.

My God.

That's a nail there.

You see it? ‐ ‐

‐ That looks like a manmade tunnel.

My God. I can't believe we're seeing this.

‐ On the next "Lost Gold of World War II"...

‐ Seeing all that wood

and seeing that it's an actual tunnel,

my gut feeling is that this tunnel leads

right to the waterfall.

They wouldn't have had this in World War II.

I'm thinking somebody was here before us.

‐ Japanese military criminals confessed to save themselves.

That's how MacArthur got the treasure.

‐ Is there any actual evidence to back this up?

‐ It's kind of extraordinary how much evidence there is.

‐ Get out of here!

Captioned by Los Angeles Distribution and Broadcasting, Inc.