All language subtitles for Shark.Island.Showdown.2026.1080p.WEBRip.x264.AAC5.1-[YTS.GG - YTS.BZ]

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NARRATOR: Hidden amid
the vast blue expanse

of the South Pacific
lies Norfolk Island.

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YTS.BZ

Once the most feared penal
colony in the British Empire,

today its remote waters
draw in visitors

of another kind.

Sharks.
ADAM: woah, tail slap!

NARRATOR: Year after year,

a wide variety of sharks
converge on this isolated

rock patrolling for resources.

But which species is king
of this shark island?

LAUREN: Oh my gosh.

NARRATOR: It's summer
on Norfolk island.

And as the waters around this
ancient volcano begin to warm

beneath the surface, a
battleground is stirring.

An army of giant Tiger
sharks are on the move.

LAUREN: Looks like they're back.

ADAM: That's a lot
of detections.

LAUREN: That's at least twenty.

NARRATOR: Shark experts
Lauren Meyer, Adam Barnett

and Charlie Huveneers

have been studying
the island's Tigers

for the past six years.

Attaching over
forty individuals

with satellite tags,
they've discovered,

every year, these apex predators
travel over a thousand miles

across the Pacific to reach
this isolated island.

Coming from as far afield
as Fiji and New Caledonia.

To join a host of
other shark species

around Norfolk Island's
crowded shores.

LAUREN: The sharks start
arriving in early spring,

and stay through late autumn.

But our big question
is still why?

Why come from so far
to such a tiny island?

And what happens when so many
sharks descend on one place?

NARRATOR: To help
solve the mystery,

the team needs to get eyes
and ears underwater.

Something easier said than done,
in these shark-filled seas.

CHARLIE: If you see
the Tiger Sharks

you guys will have to decide on
when is the safest to come up.

If that happens, Lauren's
got her shark shield,

so get close together, and
kind of face each other,

so that each other can
see each other's back.

NARRATOR: With over five
thousand dives to his name,

Adam promised his wife this
would be a danger-free trip.

ADAM: Her words were
ringing in my head.

You've got kids now.
Stop doing dumb things!

NARRATOR: While the satellite
tags they've already fitted

to the Tigers give good
broadscale movement data,

the information only gets
sent when the shark fins

break the surface.

So to find out what's really
happening at this battleground,

a different approach is needed.

Armed with an electric shark
shield attached to Lauren 's

ankle, designed to give off
an uncomfortable shock

to any approaching shark ,
the team move over the reef.

Their mission, to set up an
underwater listening station

so they can eavesdrop
on the island's sharks.

But first they need to
find a good spot for it.

Sixty-five feet down,

the divers are met with a
kaleidoscope of life and color.

Coral dominates much of the
inshore zone on the south

and east of the island.

Some of the most southerly
reefs on the planet,

they support a vast
array of fish.

But where there's
this much life,

predators are never far away.

A Dusky Shark comes over
to check the divers out

but is quickly repelled
by the electrical signal

coming from Lauren 's
shark shield.

Like Tigers, adult Dusky
Sharks are thought to be

highly nomadic.

Growing to lengths
of twelve feet,

they're formidable predators
in their own right.

Fast.

Strong

and highly inquisitive,

everything from squid
and fish to skates

and other sharks have been
found inside their stomachs.

LAUREN: Dusky Sharks are
shaped totally different

from your Tiger Sharks.

They're your fighter
pilots of the sea.

And with that pointy nose and
really large pectoral fins,

their agility is
off the charts.

NARRATOR: But here
on Norfolk Island,

little is known
about their habits,

or where they come from.

LAUREN: Throughout their
range Dusky Sharks are used

to being top dog, I mean
they are right at the top

of the food web, I'll be
really curious to see

what happens when they come up
against another really

top predator, our Tiger Shark.

NARRATOR: Beyond the coral reef,
the island's volcanic flanks

slope sharply into
the inky depths.

Here, things look and
feel very different.

This is perfect
Tiger territory.

ADAM: Tigers are known
as a generalist predator,

so they will eat just about
anything they can get

their hands on, or, or I
should say their mouth on!

And on those reefs that we
dived, there was definitely

drop offs and canyons
where if I was a shark,

I'd be swimming along
knowing you could pop up,

maybe even ambush.

NARRATOR: It's the perfect
place for a listening station.

But a potentially
dangerous one.

A pile driver is lowered
from the boat above,

and the team get to work.

LAUREN: To bash in that pole,

you're really making
a fair bit of noise,

if there's one thing
sharks are attuned to,

it's noise underwater.

NARRATOR: With a sense
of hearing many times

more sensitive than our own,

every shark in the area now
knows they're here.

LAUREN: So as you're installing
it you kind of have to turn

your mind off, get the job done,
then we're not dinking around,

we're getting out of there.

NARRATOR: One of eighteen
encircling the island,

the stations will detect
and log any tagged sharks

moving within sixteen
hundred feet of them,

giving the team a detailed
picture of where the island's

different shark species are
hanging out, and where

they might be clashing.

Back at base, the team
plan their next move.

LAUREN: So this is our model.

NARRATOR: Located 870 miles east
of the Australian mainland,

Norfolk Island sits on the
frontline between tropical

and temperate waters, and at the
confluence of major currents

LAUREN: On paper this
is a hunter's paradise.

NARRATOR: The tip of a
vast underwater volcano,

its flanks plunge down to depths
of around 16 thousand feet.

LAUREN: And that's the perfect
spot for lots of nutrients

to come up from the deep sea,
which means you get big coral

reefs and all of this
structure for fish.

NARRATOR: Hundreds of thousands
of seabirds also call

the island home, as do three big
species of predatory sharks,

Duskies,

Galapagos

and Tigers.

LAUREN: Norfolk Island is a
small rock in the middle of

nowhere, and it is absolutely
jampacked with sharks,

so this area is rife
for a battleground.

We want to figure out
where the conflict is,

and who's gonna
come out on top.

NARRATOR: It's a big job,
but fortunately the team

have a head start.

When they tagged the Tiger
Sharks with satellite trackers,

they also took blood
samples from them

samples that give them clues
as to what they're hunting

and where that hunting
might be taking place.

LAUREN: About thirty-five
percent of their diet

is going to be fish.

And if you're looking
for that kind of prey,

these coral sites
here are perfect.

CHARLIE: Even though
Norfolk is pretty small,

we can't monitor the whole
island continuously,

so we're going to be focusing
in some of the areas

where we think most of the
interactions may be occurring

and these are the areas where
there is the most food.

LAUREN: We know that seabirds,
not just on Norfolk,

but throughout the world
are a big important player

in Tiger Shark diet, which
means that I think

our Tiger Sharks are going
to be clustering up here.

NARRATOR: Every dusk, tens
of thousands of shearwaters

gather in vast floating rafts
along the island's protected

western shores.

This is Norfolk's second
major food resource

and potential battleground.

LAUREN: Dusky and Galapagos
Sharks aren't dumb,

is it possible that
they're also feeding

on some of the birds out here?

ADAM: Well it's not that far
to travel, I mean they're only

a K or so off, and they're big
enough sharks to eat a bird,

it's just a matter of that's
in their diet or if the Tigers

being out there actually turns
them off from going out there.

LAUREN: Also on the west
side of the island, though,

is Headstone.

NARRATOR: For as long as can
be remembered, islanders

have been getting rid
of their waste here,

including all the cows and
offal from one the island's

main industries,
cattle farming.

LAUREN: Because Norfolk's
a volcanic island,

it doesn't have anywhere
to bury a dead animal,

because it would
risk the ground water,

so essentially, all the cows
here it's burial at sea.

NARRATOR: With that much free
food going into the water,

could Headstone also be a
potential clash point?

LAUREN: Now we know there's
Tiger Sharks there,

but that doesn't mean that the
Dusky and Galapagos Sharks

aren't also using
that same resource,

and that's going to be
a spot for competition.

ADAM: Are they fighting for the
resources, is it a battleground?

Or are the big Tiger
Sharks actually eating

the other sharks?

NARRATOR: Three
potential battlegrounds,

three potential armies

and just ten days for the team
to uncover what's going on.

Dawn on day two of the
expedition, and the team

head to Headstone Bay to
conduct their first experiment.

With so much free food
going in to the water here,

the team's hunch is that this
is the most likely location

on the island for conflict.

If they can place a camera
on the back of a shark,

they may be able to reveal
what's really going on

beneath the waves.

As scheduled, a truck pulls
up to the rubbish chute

and a dead cow they've
sourced for the experiment

is sent into the sea.

As it hits the water, the
sound echoes through the bay

and blood leaches
into the water.

CHARLIE: So there's a bit of a
scent trail from that cow now,

and sharks are often referred
as the 'noses of the sea',

so they've got amazing
olfaction, and that scent,

that odour from the cow is
likely to be attracting some of

these sharks, but which species
is going to turn up first,

and which species is going
to start consuming the cow

is what we're here
to learn from.

NARRATOR: Launching a drone,

Lauren monitors the
cow from above.

It doesn't take long
for a huge shadow

to emerge out of the blue.

LAUREN: So we've got a shark,
it's just going in towards

the head of the cow now.

There you go.

ADAM: Oh yeah.
LAUREN: Coming in now.

CHARLIE: That's a
Tiger too, obviously.

LAUREN: Yeah, that looks like
a Tiger, it's a good size,

NARRATOR: At over 13
feet, it dwarfs the cow.

Ripping into it with
its razor-sharp teeth,

it makes short work of
the cow's leather hide.

And as more blood is
released into the water,

more sharks appear.

LAUREN: They're both
still just circling,

they don't seem to be too
bothered by one another but.

ADAM: Maybe they're
patient eaters,

they're already
taken big chunks.

LAUREN: Yeah.

ADAM: Then we had three
come in, four,

then it started to kick off
and they started ripping it

to shreds.

It got to the stage where
they'd ripped it to shreds

so much that the whole
intestine got ripped apart.

Oh. Tail slap!
LAUREN: Oh, man.

CHARLIE:That stinks.
ADAM: Yeah, it's gross.

LAUREN: That is disgusting.

ADAM: And we were splashed all
over us with poo basically,

intestinal, it stunk, it
smelt, it was terrible.

And it's over everyone.

NARRATOR: For two hours,

the Tiger Sharks
take turns to feed.

CHARLIE: People typically
think that there's a hierarchy

in sharks, when the bigger
shark will dominate

over the smaller one, but what
was different that we saw here,

is that even though we saw
several sharks in the area

it wasn't just one
shark being dominant.

The sharks kind of took
turns feeding on the cow,

and coming and taking chunks
and bites of the cow.

NARRATOR: But three
hours into the feeding,

a very different
shark turns up.

RICHARD: What's
that little thing?

Is that a Tiger?

CHARLIE: Is that a Tiger
or is that something else?

That actually could be a
Galapagos or Dusky Shark.

It's definitely smaller.

RICHARD: It's got
a pointy head.

CHARLIE: Oh yeah, definitely
and it's coming closer now.

Yeah, that's a Galapagos
Shark.

NARRATOR: Very similar in size
and shape to a Dusky Shark,

Galapagos are oceanic nomads.

Normally found at
remote seamounts,

they're opportunistic hunters,
and everything from fish

and sharks, to squid and even
their own kind have been found

inside their stomachs.

But despite the free
food on offer,

it stays away from the cow.

ADAM: Size matters. A
smaller Galapagos Shark,

which might be big
in its own right,

compared to these sized Tigers,
it's not going to get involved.

NARRATOR: For the team, it's
their first inkling that while

there may be no hierarchy
between the Tiger Sharks,

competition and conflict
between the other species

on the island may
well be taking place.

LAUREN: It really shows
that around Headstone,

Tigers are king.

NARRATOR: But what happens
on the rest of the island?

Are Galapagos wary of Tigers
because they're eaten by them?

With multiple shark
species in the area,

Charlie readies a
fincam to find out.

LAUREN: There Charlie,
just at eleven.

NARRATOR: If he can get it
on the back of a Tiger,

it could reveal if they're
hunting other sharks.

CHARLIE: Oh [BLEEP],
it came off.

[BLEEP] It sunk.

LAUREN: Bummer.

ADAM: Have some poo
for good measure.

CHARLIE: Unfortunately as I was
trying to deploy the camera,

the camera kind of got
snagged on the deployment arm

and as I removed the arm,

the camera slipped off the
fin at the same time.

ADAM: In hindsight he
should have used his arms,

he's so bloody
long, you know,

but he was beating
himself up about it.

LAUREN: it's a bummer it didn't
stick but it's not a waste

of a day, we still managed
to get our Tiger Sharks here

and we saw either a Dusky or
Galapagos Shark just waiting

in the wings, so it really
starts to paint a picture

for us about how the
different species interact,

and maybe those Duskies
and Galaps are here

but they're just not keen
enough to compete for cow,

especially when your big
Tigers are in the picture.

NARRATOR: Day three
of the expedition,

and with the cow guts
removed from their clothes,

a fresher smelling team
return to the water.

LAUREN: Our plan today
is pretty simple.

Catch and tag as many
sharks as we can.

And that way the listening
stations we have all around

the island can start
picking up data.

NARRATOR: Laying lines at
several locations around

the island, it doesn't take
long for the sharks to bite.

ADAM: I think we've
got our first one.

CHARLIE: Yep.

Three meters.

Lauren you got this?
LAUREN: Yep.

NARRATOR: It's a Tiger.

CHARLIE: Slack.

NARRATOR: Wrestling it in
takes all the team's strength.

CHARLIE: Need it
tighter on the tail.

Yep, that's it.

NARRATOR: Tail safely secured,
the shark is turned upside down

and put into a trance-like state
known as tonic immobility.

CHARLIE: That's better.

NARRATOR: Giving the team time
to prep a very different kind

of kit to a satellite
tracker an acoustic tag.

LAUREN: This will implant
into the shark,

and give us great data
on fine scale movements,

so we can understand
what bit of the island

these big Tiger
Sharks are using.

NARRATOR: To fit the tag,
Adam makes a small incision

underneath the skin.

The tag is then slid
into place.

For the next ten years,

it will give off a
steady acoustic signal

which will be picked up
on the listening stations

around the island.

Safely sewn up, the shark
is ready for release.

In just a single day, the team
catch and tag eight Tigers,

and five Dusky a
nd Galapagos Sharks.

Evidence this island
is full of sharks.

Lauren takes blood and tissue
samples from them all.

The stable isotopes inside
could reveal what the Dusky

and Galapagos Sharks are eating
and if, like the Tiger Sharks,

they're targeting fish,
birds and cow.

Valuable information,
which could help them

uncover where these
sharks might be clashing.

Back on land, the
work doesn't stop.

While Adam processes the blood
samples, Charlie and Lauren

check out the second possible
battleground the bird rafts.

LAUREN: This western side of the
island is absolutely covered

in shearwater burrows.
In the grass under here,

there's really nice dirt
for them to dig nice

and deep burrows, and
have their chicks.

Now, almost this whole colony
should be really far out

to sea feeding, but shortly
we're going to start see them

come in quite close and start
rafting up just about a k

or two offshore.

NARRATOR: Known locally as
ghostbirds due to their

mournful cry, shearwaters
hunt the abundant fish

that live in the waters
around the island.

Only returning to their burrows
under the cover of darkness.

CHARLIE: Well we think that
they're rafting to wait until

sunset to avoid any predators
once they land on the island,

but the irony is that there
actually aren't any land

predators on Norfolk Island,
but in the meantime,

they're sitting on the water

where they are completely
vulnerable to sharks.

Not only that, but
as it becomes darker,

it's probably harder
for the birds to see

the approaching sharks.

NARRATOR: With this much food
sitting just a mile offshore,

could the island's sharks be
battling over this valuable

resource?

Two years ago, the team
attempted to infiltrate a raft

with a fake bird, bristling with
cameras, they nicknamed

"Shazza".

VOICES: oooooh!
ADAM: No!

VOICE: Not Shazza!
ADAM: Shazza!

NARRATOR: But just seconds
into its maiden flight

it released early and
fell down a cliff.

ADAM: Yeah, it wasn't
our finest moment!

NARRATOR: Using a local
climbing team,

they did successfully
retrieve 'Shazza'

and subsequently deployed
it on a huge raft.

But when they went to look for
her the following morning,

the fake bird was nowhere
to be seen or heard.

LAUREN: Vanished, disappeared.

NARRATOR: But her
story didn't end there.

ADAM: Months later, she washes
up on the Australian mainland,

like eight hundred ks away,
just she's there! Y'know.

Then they somehow worked
out it was our bird,

we got contacted and we
got our cameras back.

Didn't find anything on it,
but we got our bird back.

NARRATOR: This time, the
team have a new approach.

ADAM: Yeah, so we thought let's
give up on the plastic bird

idea, and let's bring a
real human back instead.

NARRATOR: Shark expert and
drone pilot Richard Fitzpatrick

has been pushing the
boundaries of what's possible

with drone reconnaissance.

ADAM: He brought his
fancy pants drone,

it's like this really expensive
drone with star vision,

so you can see at night from
the starlight, it's amazing,

so we brought him out to
actually scope the area

after dark to see
what's going on.

CHARLIE: How far are you now?

RICHARD: Two point
six kilometres out.

CHARLIE: Ok.

RICHARD: We're coming
up on to this raft,

we're about eighty
metres above it.

LAUREN: I mean, that looks
like a ton of birds.

Having the starlight drone
was really revelatory.

It meant that we could kind
of watch not just how long

the seabirds were out there, but
exactly what they were doing

Oh my gosh!

ADAM: The whole thing
has just been spooked!

LAUREN: The whole
raft just disappeared.

Gone.
ADAM: Gone.

LAUREN: Do you see anything
there in the water?

RICHARD: Nah. I didn't see
anything that time.

LAUREN: Yeah, I didn't either,

but they definitely all just
took off and scattered.

NARRATOR: No shark
can be seen,

but the birds are
clearly on edge.

And as they move
to the next raft,

the team spot some
interesting behaviour.

RICHARD: So look, you
got this raft here.

And looks like the
birds at the back,

they don't want to be there.

They're flying straight
to the front.

ADAM: Well obviously the ones
at the back aren't feeling

happy so they're jumping
to the front

where they think it's safer.

CHARLIE: In any kind of
schools or groupings,

animals on the edges are always
going to be more vulnerable

than those in the centre.

ADAM: It's almost like they're
rolling the dice and everybody's

got to take their little turn
at being in the worst spot.

LAUREN: All the birds
were so flighty.

I mean there was just
explosions and they'd all

take off all of a sudden, and
it meant that they were really,

really on edge which
was exciting to see,

but the bigger discovery was
actually how long they stayed

rafting out at sea.

NARRATOR: As they approach full
darkness, the team expected

the birds to start returning
to their burrows on shore,

but instead they stay
out in the pitch black.

ADAM: With this
star vision drone,

we saw they were there
for hours after dark!

So they started rafting at about
four o'clock and now it's nine,

nine pm, so they've been
rafting for five hours so far,

I mean that is a much bigger
window than we expected,

and they're still going.

LAUREN: We're not talking
about just one or two

floating seabirds, I mean these
rafts are hundreds to thousands.

These birds have no ability to
see what's underneath them,

they're the definition
of a sitting duck.

ADAM: Oh, there's
another eruption!

NARRATOR: It's a big
breakthrough for the team.

With this much food available
for so many more hours

than they thought, could this be
the island's key battleground?

LAUREN: With a resource
that's that easy to catch,

and birds that vulnerable
on the surface,

it's probably not just
our Tiger Sharks,

I mean Dusky and Galapagos
Sharks are incredibly

agile predators.

They absolutely know
what they're doing.

I wouldn't be surprised
if they're keying in

on this resource as well.

NARRATOR: With the team
now aware that the window

of opportunity to catch
shearwaters is far longer

than they thought, the next
afternoon they head out

to the bird zone to try and
catch and tag more sharks.

In the space of
just two hours,

three more Tigers are caught.

But the island's other shark
species are nowhere to be seen.

LAUREN: It was exclusively
Tiger Sharks.

ADAM: Not a sign of a Dusky
or a Galapagos anywhere.

NARRATOR: Just like Headstone,
have the Tigers secured

this area as their own?

LAUREN: Could this be that
this big resource is just

Tiger Shark area?

The other species really
can't get a look in,

and in that area along the
west coast of the island

from Headstone all the way
out to the seabird rafts,

the Tigers are king.

NARRATOR: As more and more
Tigers are caught,

another pattern emerges.

Virtually all are big
mature females.

LAUREN: One of our big
questions is why are so many

sharks coming here?

I mean at this island of plenty,
it's pretty clear that there's

abundant food, but could
this island be so much more?

ADAM: These Tiger Sharks
that are here are big,

and they're all mature so
we're trying to work out

why they come here.

They come here to feed, but
what else are they doing.

They don't appear to be mating,
cause they've got no scars,

but we're wondering if they're
pregnant or not in here.

Is this is gestation area, maybe
they pup around here somewhere,

but we, it's a very
hard thing to work out.

NARRATOR: To help
answer that question,

Lauren has brought in in the
expertise of James Sulikowski,

a specialist in shark
pregnancy and pupping.

And as a really big
Tiger is reeled in,

CHARLIE: Coming towards
the back of the boat.

NARRATOR: They seize their
chance to deploy some new tech.

CHARLIE: One of the sharks
we caught ended up being

this very large but also
very fat female Tiger Shark,

and obviously at that size,
especially how wide

and broad that shark was,
we automatically thought

that it could be pregnant.

Got it.

NARRATOR: As the team wrestle
to get the shark under control,

James readies his state of
the art ultrasound equipment.

CHARLIE: Give us some
good news James!

JAMES: Well she's
definitely pregnant.

CHARLIE: Woohoo!
LAUREN: Yay! Pregnant.

ADAM: You can see 'em.

JAMES: There's the head.
There was a head right there.

LAUREN: So as James was
ultrasounding her, we saw,

clear as day, this little shark
head and little eye ball

and little shark teeth,
indicating that not only

was she pregnant, but
she was very far along

and ready to pup any day now.

I've been waiting excitedly
for someone to ultrasound

these Tiger Sharks for years,

so to finally have that
visual confirmation of what

we've all been wandering
about was outstanding,

absolutely fantastic.

NARRATOR: Around the world,
little is known about

Tiger Shark pregnancy.

Basic facts, like
how long it lasts,

remains a mystery.

And here in South Pacific,
nobody knows where Tigers

give birth to their young.

If the team can find out,
it will be a giant leap

in our understanding of
these threatened sharks.

So, they ready another
bit of revolutionary kit.

JAMES: With this tag
which we've developed,

this birth alert tag, we call
it the bat, we insert it

into the female, it sits
in the uterus, it's inert,

it's rounded there's no
sharp edges on this thing,

and our hope is that it stays
in the female throughout

her pregnancy.
She'll find a spot,

wherever that might be, give
birth, the babies comes out,

this comes out with the babies,
transmits the location

and tells us exactly where
all that magic's happening.

NARRATOR: This is the
first time this equipment

has ever been deployed
on a Tiger Shark

in the South Pacific.

JAMES: What I do need is
somebody, somebody on the tail

probably, to help
stabilising it a little bit.

OK, we're good.

Yes, first pregnant Tiger.

CHARLIE: Keep cruising,
she's cruising.

LAUREN: I'm so excited,
lost my voice,

but that's alright, the
science is getting done.

NARRATOR: With just four
days left on the island,

and no sign of conflict at
Headstone or the bird raft zone,

Lauren decides to stakeout
the coral areas

that dominate the south
and east of the island.

Home to vast array of fish,
could this be the area

where the island's
sharks are clashing?

But as the drone moves
over the shallow reefs,

it's not conflict she
finds, but the opposite.

LAUREN: It's low tide at the
moment so we're able to really

clearly see some Dusky
and Galapagos Sharks.

NARRATOR: Around the world,
it's rare to see Dusky

and Galapagos Sharks together.

While Galapagos Sharks
like remote seamounts,

Duskies tend to prefer water
closer to the mainland,

and along continental
shelves.

But here on Norfolk Island, not
only are they seen together,

but they seem to be sharing
the same territory.

Could the presence of so many
big Tiger Sharks be pushing

them together?

LAUREN: Now, there's only
about two feet of water,

so it's a pretty safe
spot for them to be in.

It's way too shallow for
Tiger Sharks to come in here

at the moment, but as soon
as this tide comes in,

it's really going to be an
opportunity for conflict,

if our Tiger Sharks are coming
here to hunt reef fish.

NARRATOR: And conflict is
exactly what Lauren thinks

might be happening
somewhere on the island.

Because the acoustic listening
stations are reporting

back some strange data.

LAUREN: Our Tiger Sharks
are checking in kind of all

the time, every day around
the island, but interestingly

our Dusky and
Galapagos Sharks,

a few of the tags
have gone dark.

Now we can't say why exactly,

but it could be that they
simply just go offshore,

I mean they are
pelagic predators,

or if they're cruising
off the reef flat,

and around in to
Tiger territory,

they might be getting munched.

So while we're not a
hundred percent sure,

I'm really curious to
see what they're up to,

and hopefully we can keep
tracking them with the drone.

NARRATOR: But as the tide rises,

the sharks start to spread out,

and head into deeper water,
out of the drone's range.

Over the next couple of days,
thirty more sharks are tagged,

and tissue samples taken.

And as the data pours in,

another strange
pattern emerges.

LAUREN: So we've just gotten
the blood results back

from our Dusky and Galapagos
Sharks, and they're eating

only fish, that means
no seabirds, no cow,

at least not in the quantities
that we can detect.

CHARLIE: Well, that's
surprising considering

the amount of food available,
the amount of seabirds

and offal being disposed of.

LAUREN: Yep. And I mean,
those seabirds,

there, there's heaps of them.

And they're there pretty much
all night, so it's a huge

missed opportunity for
the Dusky and Galaps.

ADAM: Well I mean, what
about when we have a look at

the movement data,
what does that show?

LAUREN: Yeah, so if we
look at the movement data,

it all kind of makes sense.

We've had thousands of
detections all around

the island, but if you analyse
the data by species as a heat

map, you see these really
interesting results.

So we can see that our Tiger
Sharks are really using

the whole island, but mostly
using this west coast,

and that makes sense right,
that's where the seabirds are,

and that's where the cow
offal comes off the chute.

However, our Galapagos Sharks,
they avoid that area entirely,

they're not going anywhere near
those Tiger Shark hotspots.

ADAM: So despite being lots
of birds, and lots of cow,

lots of good resources, the
Tigers are still putting

the fear of God into
these little ones!

LAUREN: Our Duskies are going
to do the same thing

as the Galapagos, even though
they're a little bit bigger,

probably could hold their
own against a Tiger Shark,

they're just using this
area here and here.

We realized that these three
species were partitioning out

the island into distinct
territories.

CHARLIE: So now I guess the
diet makes a bit more sense,

that's probably why they
don't have the seabirds

and the offal in their diet
because they're avoiding

the area.

ADAM: Yeah, and the question
is why are they avoiding it.

Is it because of
the Tiger Sharks?

NARRATOR: Another strange quirk
of the data is that the Dusky

and Galapagos Sharks have
the highest concentration

of detections at the
island's two harbours.

Could these locations
be a source of conflict?

LAUREN: Now those areas are
kind of crumby habitat

for a predator, not much to
feed on, it's usually pretty

stirred up with lots of
activity, so rubbish hunting,

but as soon as we got down
there, it did not take a rocket

scientist to figure out
what was going on.

NARRATOR: At Kingston Harbour
the team are met with a hive

of activity.

Fishermen line the wharf, and
as they fillet their catch,

a steady stream of fish
scraps enters the harbour.

To see what's happening
beneath the water,

the team ready a shark
cage, and Adam dives in.

Underwater, Adam
is met by the sight

of a huge Dusky and
Galapagos gathering.

ADAM: It was a bit chaotic, the
visibility wasn't that good,

they come out of the gloom,

and I was surprised
at how big they were.

They hear the splash,

they feel it and they try to
be the first to get there.

Then one of the big ones, she
decided she almost wanted

to come in a couple of times
and that was when I was like,

woah, hang on a second, you're
not meant to be in here.

LAUREN: Coming down to the
jetty, all of our data

is making sense, because what
we have is some very eager

Dusky and Galapagos Sharks
and we can see very clearly

they're here for
the filleted fish.

As soon as that fish hits
the water, man, those sharks

are on to it. And
that indicates to us,

that this isn't something
new, that as the fishers

go out and collect their fish
and come back and clean it,

this is the perfect spot for
our Duskies to come in

and grab a free feed.

Just like our Tiger
Sharks around Headstone

that occasionally will cruise
by to get a free feed of cow,

our Dusky and Galapagos Sharks
are doing the same thing,

they're coming in to grab
a quick and easy feed.

NARRATOR: With the sharks
carving up the island into

distinct territories,

one big question remains.

What happens when smaller sharks
here run into bigger ones.

To answer that, it's
redemption time for charlie

as he readies the fincam
retrieved from the ocean

after the failed Tiger
Shark deployment.

LAUREN: Oh man, just
the one we ordered.

NARRATOR: Within seconds,

the team hook on to a
huge adult Dusky.

Pulled on to the dock, a tube
is inserted in its mouth,

to help it breathe, while the
team hurry to reduce stress

on the shark.

Placing the camera tag on,

the team now need to
flip the shark around

and get it back in the water.

At over ten feet this
is a full grown adult.

Twenty-four hours later

and with the camera tag
safely retrieved,

the team gather one
last time to review

the footage from
the Dusky Shark.

LAUREN: That is
fantastic footage,

look she's just following
this one perfectly.

Getting the footage back
and starting to watch it

was incredible. The footage was
stunning, I mean, right away

she tucks in behind these
other sharks and you get this

beautiful stream of three or
four sharks all in a line.

NARRATOR: For over five
minutes, the Duskies patrol

in a line over the coral.

CHARLIE: And now it's stopped.

LAUREN: Yeah, now
it looks like she's.

ADAM: Now she's veering off.
LAUREN: Gone off to do her own.

ADAM: Yep.

ADAM: Interesting, another
shark, away from the site,

in deeper, deeper water of
some sorts, it's hard to say.

CHARLIE: It's just
uh, nearly seven pm.

ADAM: Yeah.

LAUREN: Just cruising
mid-water column.

NARRATOR: Several times it
meets up with fellow Duskies.

And rather than hugging the
safety of the shoreline

where it could easily hide
from Tigers, it spends most

of its time in deep pelagic
water where the chances

of running into a
Tiger are higher.

Four hours in to the track
and the Dusky behaviour

changes once again.

ADAM: Oh. Tuna.
Was that a tuna?

NARRATOR: A tuna moves past it,

and the shark makes a sudden
movement towards the surface.

ADAM: Oh, it's going up.

Yeah, to the surface,
but nothing,

I can't see anything up there.

CHARLIE: It's checking
something out,

but there's nothing
there to be seen.

ADAM: No, well not
by our eyes anyway.

CHARLIE: You can see
that sort of turning.

ADAM: Yeah.
CHARLIE: Having a look.

ADAM: And going very
close to the surface.

LAUREN: I'm surprised, I would
have thought that y'know,

a shark of this size that's
eating mostly fish should be

hugging the sea floor.
ADAM: Yeah.

LAUREN: Especially at this time
when you know you've got Tiger

Sharks around.

CHARLIE: Why did that shark
make that decision to start

veering up? Did the
shark smell something,

did the shark see something
that we didn't?

ADAM: Maybe there's a
bit of action there

and that's why she's
sort of looking around,

to see what's going on,
all this action.

LAUREN: Yeah.

CHARLIE: That's, that's, I
reckon that's most likely.

ADAM: Yeah.

NARRATOR: The team didn't
get the epic battle

they were hoping for.

But it's a tantalizing
glimpse into the secret

lives of Norfolk's Dusky Sharks

and suggests the Duskies will
risk straying into Tiger Shark

territory if the opportunity
to feed is there.

LAUREN: While our mission
coming into this was

to really understand what kind
of conflict was going on

with this many sharks,

but what we're starting
to realise is Norfolk

is such an island of plenty,
that these individuals

and species are able to carve
up their own territories.

ADAM: The Tigers
are the top dog.

There's no surprise there,
they're bigger, they're massive.

The Galapagos and the
Duskies have to avoid them

and have their own
little areas.

LAUREN: Now, that doesn't
mean that conflict

isn't going to occur.

You know our Duskies
are travelling out

into areas where we know
Tiger Sharks are plentiful,

so there's still some
secrets the island holds.

CHARLIE: There could
still be some kind

of conflict or some
kind of competition,

and for us we'd love to
be able to come back,

and keep deploying
these cameras,

to be able to get a better
understanding of the behaviour

of these sharks, and maybe one
day get a more of an interaction

between a Tiger Shark
and a, and a Dusky Shark.

NARRATOR: In the meantime,
the importance of this island

to the Pacific's Sharks
continues to grow.

Just four weeks after filming,
the birth tag popped off,

at a secret location just a
few miles from the island.

With the pups being born so
close to so many big sharks,

have they stumbled across yet
another new battleground?

The team are already
planning their return.