Lagina, along with their partner Craig Tester

and fellow landowner Tom Nolan, head

to the newly drained swamp.

I do not like being in the swamp.

It stinks.

It's nasty.

But if there's something interesting down there,

then I want to see it.

We have to dig.

We have to investigate.

And if it takes getting dirty, and wet,

and cold, and miserable, and smelly, I don't care.

I want an answer.

Well, there's a trio.

Yeah.

Yeah.

Hey, what's in there?

You tell me.

No, no, no.

Mysteries.

All right, well, what-- what are we--

what are we standing around for?

Saddle up.

Yeah, let's go.

Turn the key, Billy.

NARRATOR: Because a thorough draining of the swamp

has always been difficult to achieve,

the area remains one of the least explored on Oak Island.

But recent discoveries, including Dr. Ian Spooner's

confirmation that the swamp was most likely man-made some 800

years ago, has made digging in the area one

of this year's major agendas.

First among the team's list of potential target sites

is the flat stone walkway discovered earlier this year

by diver Tony Sampson.

Today's operation is particularly

meaningful for Tom Nolan.

It was his father, the late treasure hunter Fred Nolan,

who spent more than five decades of his life being convinced

that the key to solving the Oak Island mystery

would be found in the swamp.

Well, Rick, it's hard to believe.

We can actually see this machine in the swamp.

You know, if Dad had been here to see that out there,

he hardly could have believed it.

Hopefully, we can finally get to the quote-unquote

"bottom of this."

You know, this things-- this--

hopefully, this will be a game changer for this bog

and what we can, you know, get it to tell us.

I look out there.

And I see, you know, look at all the assets

we're poring through this.

And yet, you contrast that with the years

your father labored here, just you and he.

I mean, it's quite a significant difference.

Yeah, I think if we can get out there and take some

of that top layer off, I think there's

things out here to be had, so--

Well, let's clean that up and see what we got.

How's that?

[intense music]

Let's do it.

All right.

All right, here we go.

NARRATOR: After 225 years of backbreaking work,

frustrating setbacks, and bitter tragedy,

the Oak Island mystery may finally be

on the verge of being solved.

But as the Laginas and their partners know all too well,

the island does not share its secrets willingly.

There is likely more hardship ahead,

coupled with the ever present threat

of a curse that says one more must die before the treasure

can be found.