Original subtitles

The Poseidon Institute

proudly presents the Mantis Five.

The Mantis Five is a cutting edge sub for the 21st century.

Wow!

Another fabulous event planned by moi, if I do say so myself.

- It's perfect. Thank you. - It's okay.

It's exciting to be finally launching

- our new submersible today. - Yeah.

And Ellis, thank you.

The Mantis Five wouldn't exist without you.

It was an honour to be involved in the design.

Well, none of it's been tested in the field yet.

It'll work. Just wait and see.

Brock, let's go welcome our arriving media.

You can make them all some of your famous Brockaccino coffees.

He's just jealous. Everything's going to be great.

- Thank you. - Yeah.

It's the last symbol, it must be the energy source.

We've gone over the area heaps of times.

Searched everywhere. Nothing.

Maybe our calculations were wrong.

Or there's nothing there.

We should join the others.

Wait, you've got the card, right?

Yep. Even did a drawing. Here, have a look.

We made Ellis a card for his sub launch today.

- Under! - No good?

I can do better. It's just--

Maybe that's it.

What? I hate it when she does that.

Guys, we've been looking in the wrong place.

What is she talking about?

The map!

We've been able to track down every symbol but the last one.

Yes, you've looked everywhere on the Island.

But not under the island.

What if the energy source was below the surface?

I like it.

A nice theory,

but how are we ever meant to see what's down there?

The deepest a recreational scuba diver can go is 130 feet.

You're not saying what I think you're saying.

Oh, yes you are, aren't you? No. No!

Test run in the Mantis Five.

I like it.

♪ A strong case of speculation How♪

♪ It takes more than intuition♪

♪ To work the situation out♪

♪ It's right before your eyes

♪ Can you feel it

♪ It's right between the lines ♪

♪ Try to reveal it

♪ So look until you find All of the pieces ♪

♪ Put them together Now you see it ♪

♪ Rock Island Mysteries

Mantis Five is the most complex sub...

Yes, yes.

The Mantis Five has scanners

that uses a combination of light refractors and echolocation

to detect what's underwater.

But, it's Institute property.

My mum's in charge of this whole project.

I would never suggest we take it for a joy ride.

- Yeah. - You wouldn't?

But if the onboard scanners are long range

and we have the coordinates from the map,

couldn't we use them to scan the area

without ever leaving the dock?

Hey, what devious plan are you all cooking up?

Oh, just congratulating Ellis on his fine work.

I'm off to the mainland, picking up the pilots for the sub.

- Will you be gone long? - Maybe an hour or so.

But when they get here,

no-one mention the Mantis Two, okay?

It's considered bad luck.

Why?

It set off 20 years ago with its pilot Romina,

and never came back.

But the Mantis Five is state-of-the-art tech.

Right, Ellis?

- Definitely. - Okay, bye.

- Bye, Mum. - See ya.

So, what do we think?

That's so sad about the Mantis Two.

About having a look on the submersible?

To use the scanners to search for the energy source.

This is our one chance to try this.

The sub is going on a month long mission from tomorrow.

An hour is plenty of time to duck in and out of the sub.

What if we go in,

see what we can find and leave. Five minutes max.

Okay.

This is Mantis Base calling Mantis Five.

How's it looking down there?

Mantis Base, this is Mantis Five.

It is looking amazing.

Sorry there are only three seats.

Slash, not sorry. You lost a rock, paper, scissors.

You guys are so predictable. You always go rock.

But one day I won't!

Guys, focus! We're on the clock.

While we're in the sub, which we shouldn't be,

I'm in charge of everything. That means no touching.

Mantis Base, we have a party pooper down here.

I repeat, a massive party pooper.

I don't want to get in trouble either. So Ellis is in charge.

Was there a window, at least?

I can stream the outside cameras into your screens.

Cool.

Good morning, Ellis.

Who is that?

Irma, this is Taylor and Meesha.

This is Irma,

the Intelligent Response and Monitoring Apparatus.

I programmed her myself.

I say, you are looking very intelligent today, Ellis.

Oh shucks, thanks Irma.

Did you make your virtual assistant obsessed with you?

She just recognises talent when she sees it.

Isn't that right, Irma?

Ready to comply.

What would you like to do today?

I'm inputting some coordinates, Irma.

Please scan for any sources of energy.

Things that look like doors, crystals,

or any other sort of anomalies.

Three minutes.

I need an Irma in my life.

I mean, someone to answer, "How do I look in this?"

All my wardrobe dilemmas, solved.

She does more than that.

I gave Irma complete control over the sub's navigation.

All you'd have to say is, "Irma take us to the coordinates"

and she would.

Certainly Ellis.

Wait. What?

Ellis, this wasn't part of the plan.

That's not what I meant.

It won't turn off.

- Irma, please take us back. - Make it stop.

Mantis Five mission underway.

No!

I don't think they'll be back in five minutes.

Ellis, we can't do this to Mum. We'll ruin her launch.

Or we ruin this sub and possibly die.

Ellis, my system detects that you are under duress.

Continuing original order.

Not that you don't have other things to worry about.

Emily wants to know why you're not answering your phone.

Because we're trapped underwater with no way out.

I'll tell her you're busy.

Project Bounty now in operation.

I programmed an automatic computer override,

in case of mutiny.

We're mutineers! Cool!

You have to override the override.

Irma's locked me out.

Irma, I apologise for confusing you,

but please take us home.

I can only take instructions from Ellis.

Irma, please return us to base.

Pretty please, sugar on top.

There is an 83 percent chance

this response would be given if you were being coerced.

Order denied. Commencing deep water descent now.

Emily's on her way back with the pilots.

What if she comes back and the sub's still gone?

Okay, ah...

Maybe ask her to pick up something for the launch.

That might buy us some time.

There must be some manual override.

I gave all control to Irma.

She's never behaved like this before.

This is a very dysfunctional relationship.

- Is there a distress signal? - An ejector seat?

- Escape pod? - Torpedo tube?

The docking bay is equipped with a homing beacon.

I could set the Mantis to head to that point.

That would override Irma.

Do it.

Are you sure we can't just go

for a little spin around the Island first?

No!

Too far away to connect to the signal.

But if Nori and Lila drop a relay beacon in the water

in-between us and the docking bay, that should link us up.

How do we do that?

The relay beacon is a bright orange device.

It'll be in the docking bay.

Attach it to an underwater drone.

We're on it.

You take the drone, I've got the beacon.

I can't see anything. It's too dark.

Did we hit something?

Are we inside of a whale?

Irma, I don't suppose you could give us a status update?

We have arrived at your coordinates. Mission completed.

The energy source could be just out there.

It's so dark. What did the scanner show?

That's weird. I'm detecting oxygen outside.

What if we're not just at the bottom of the Island,

but we're inside it.

That's even cooler than a whale.

No, no, no.

Emily's on her way back with the submersible team.

Already! How is she so efficient?

Okay, is this the right spot to launch the beacon?

I think so.

Look, we're halfway between the symbol coordinates

and the homing beacon.

Okay, quick!

Ah, Nori.

What are you doing with this drone?

We must be in some sort of sea cave.

Well, let's take a peek. You said there was oxygen.

We should stay here till the beacon's activated.

We can just duck in and out.

Like we did with this sub.

Unusual movement detected outside.

Could you tell us more, Irma?

Unidentified figure is approaching.

That's both vague and terrifying.

Maybe that's just us scraping against the rocks.

Maybe if we're very, very. quiet, they'll go away.

Hello there.

Hi.

Oh please, come up. Come, come.

I'm sorry if I scared you.

I've never had guests before.

It's fine.

I'm Taylor. This is Meesha and Ellis.

And you are?

I'm Romina.

I live here.

For how long?

20 years, I think.

I lost track of time.

That logo on your shirt.

You knew how to open the hatch.

You're the pilot of the Mantis Two.

Yes, that's me.

Everyone just thinks the Mantis Two

is a wreck on the ocean floor somewhere.

Oh, no. It's through here.

I'll show you.

Then, I'll take you to the most incredible thing

you'll ever see.

Oh, come. Come take a look.

Come.

What about the beacon?

Ellis! This could be the energy source.

What are you doing with Institute property?

- We found it and returning it. - Using it for social media.

- What she said. - What he said.

I smell a Grouch mess. You're covering for him.

Ellis isn't even here. He didn't do anything.

In fact, he is far, far, far away.

He left the launch?

You wait till Emily hears about this.

We'll see who's taking the coffee orders then.

Brock. Wait!

Emily's taking the team straight to the docking bay.

Okay, I've got an idea, but we've got to move fast.

Okay.

Trippy.

Isn't it magical?

Yes, but it's also scientifically impossible.

Coral can't survive outside of water like this.

There's too much carbon dioxide.

Even with some air going to the surface.

I'm thinking this coral lives by its own rules.

I feed it algae from the fish I catch.

I look after it and it looks after me.

Romina, is there anything down here like an energy source?

A door with some crystals?

No, just the coral.

Although recently I've heard a lot of rumblings

from the centre of the island,

and the currents have been strange.

You must be hungry.

I'll get you some food.

The symbols marked the coral. That's all.

Great! Can we go now?

We can't just leave Romina.

She can go back anytime she wants.

Even I would struggle to swim home from here.

No, when she showed us the Mantis Two,

I had a quick look around and it was still operational.

Brock!

You have to give that drone back.

I don't have to do anything.

It's about Ellis, he's done something massive.

I knew it.

Just between you and me.

He's going to be offered a permanent job at the Institute.

That's impossible.

What about Irma's faulty programming?

Thanks.

Oh, you're kidding me.

Let's launch this beacon and get them back.

Romina, we want to help you get back.

We can only carry three in our sub,

but we'll find a way to get you home.

But I already am home.

I mean your real home. The surface.

No, no, I'm happy here.

I won't let you take me.

- Romina! - I don't want to go.

We need to get back in the sub.

What about Romina?

You're right. She wants to stay.

I think she's got the right idea.

I'm going to live here too.

Forever.

Thanks.

Okay, I think we lost Brock.

What did he mean about Irma?

I can guess. It's Emily.

Emily, hi.

Hey Nori, do you know where Ellis is?

I thought he'd like to meet the sub team.

Oh, he's just got pre-launch nerves.

Meesha and Taylor are with him.

Well, when he's ready, tell him he can meet us at the sub.

We'll be there soon.

Oh hey, did you know a truck's broken down on Main Road?

All traffic is being diverted to Old Coast Road.

Oh no, well thanks for the tip.

- No worries. See you later. - Bye.

I think that bought us ten minutes.

Meesha, this is ridiculous. Of course you want to go home.

No, I want to stay here, with the coral.

She's talking just like Romina.

Snap out of it.

My sweet coral.

Romina wants to stay with the coral. Now Meesha does too.

In the ocean, coral forms a symbiotic relationship

with life around it.

It provides fish with a home

and in return they provide it with food.

So what if Romina's like the fish?

She feeds it and it gives her a home.

It made her part of its system.

And now it's doing the same to Meesha.

We just have to work out

how the coral affects people so we can reverse it.

The coral is quite beautiful, isn't it?

I want to stay.

Yes. Best news ever.

It's the coral. You shouldn't touch it.

We love the coral.

One more second and...

Got it!

Guys? The relay's in position.

You should be able to link up the signal to get you home.

Guys! Are you there?

Don't you understand? This place is dangerous.

We need to leave.

We can't leave. The coral needs us.

We need to stay and protect it.

So that's the most important thing?

Yes.

What would you do if the coral was in danger?

Anything to protect it.

So how much coral would there be

if we don't find the energy source and the Island vanishes?

None.

So isn't the best way to protect the coral, to leave?

So we can save the Island together.

So leaving the coral will protect the coral.

We'll do it for the coral.

Good.

Now get to the sub.

Romina, where are you?

Guys, is the relay beacon up?

Oh, where have you been?

We ran into a slight issue.

Well, you better get a move on

because your mum's mega close to finding the sub's gone.

Okay, we're coming.

To save the coral.

Ellis, how do we connect to the signal?

First, you need to get the key to power on the sub.

Okay. Where is that?

I left it,

in the beautiful coral.

Okay, coral, you don't bother me and I won't touch you.

Great. Thanks a lot, Ellis.

You really should stay here with me.

Please, touch the coral.

I have to go home.

But you can be happy here, just like me.

Touch the coral!

You'll understand.

You have to let me go.

Rock Island is in trouble.

I need to save it, because it's my home.

Everyone I love is there, my friends and my family.

- Family? - Yeah.

Do you remember yours?

My friends and family mean everything to me.

I can't leave them.

Oh, my head.

I have got the worst brain freeze.

I remember the coral.

Then what happened?

Both of you touched it,

but the effects must be wearing off

now that you've been away from it.

Okay Ellis, connect us up to the signal.

Welcome back, Ellis.

Hi Irma, Operation Relay is a go.

Manual override in place.

No offence Irma, but we'll take her from here.

Guys, we're on our way.

When we get back, Irma, we need to discuss boundaries.

Mission complete.

Where are the others?

Wiping away any trace of us ever being inside that sub.

- Okay. - Taylor!

Mum, you're late.

I met with the team okay,

but then we were driving along the coast.

Thanks for the tip Nori, and we saw this submersible.

Mum, I can explain.

Really! Because I would love to know

how the Mantis Two just turned up by the jetty.

The Mantis Two?

With the pilot, Romina.

Well, she doesn't remember a single thing, but she's alive.

Isn't that amazing?

It's definitely not something we thought would happen.

She was gone for 20 years.

Can you imagine how her family's feeling right now?

It makes you wonder, doesn't it?

About what?

If Romina can come back after all this time...

Maybe Uncle Charlie can too.

Yeah, maybe.

Whatever you said must have gotten through to her.

Even with the power of the coral.

I just spoke about how much I love the Island, and you guys.

Aw.

Ah, it was mostly me, right?

Brock, what are you doing here?

Informing Emily about your drone stealing antics this afternoon.

Good idea, Brock.

Oh, while you're at it,

why don't you tell Emily how you hacked into Irma systems

and sabotaged her to make me look bad!

I...

I remembered I need to make some coffees.

I'll have a latte, thanks.

How'd you figure that out?

Lila tipped me off that something was suss.

So I scanned Irma and discovered Brock had planted a virus.

It wasn't her fault after all.

Well, I'm glad you and Irma are back on track.

Maybe we can all go for another spin later.

No!

So we've searched for every symbol on the map,

and still at a dead end on the energy source?

Now the tremors are so bad, they're being felt underwater.

So what do we do now?

It's all right.

I've got a plan.

This Island's not going anywhere.

♪ Rock Island Mysteries