You're taking a risk, aren't you?
I felt like chilling out.
Anyone could have walked in here.
My parents have gone to work. People don't usually drop in.
We did.
You forget.
I could always make myself disappear if I had to.
It's much easier to think underwater.
Sure is.
I mean, it must be so peaceful down there.
I can see things very clearly.
That's why I'm going back to Mako.
I've gotta find out how I got this way.
What if something else happens to you?
It's not a place to be on your own.
You're welcome to come with me.
Yeah, we're gonna have to think about that one.
Sure. I understand.
I appreciate everything you've done,
but I'm going back to Mako today.
If he's going, we have to go with him.
Sure, that's a great idea, Lyla.
Just lead him back to the moon pool.
Nixie's right, Lyla. He's going, anyway.
It's better we're with him than not.
Let's work with him.
If we don't find out how he got his powers,
how are we gonna figure out how to get rid of them?
Okay, well, that's...
not only dangerous, but a total waste of time.
The land entrance only opens up with the full moon.
Yeah, so we just need to find another source of moonlight.
And where would we get that?
You mean use my moon ring?
No way!
Why not?
Are you out of you mind, Lyla?
You have no idea what might happen.
Just forget it. Oh, come on.
I'm not doing it.
So we just wait until the next full moon
to find out what happened to his powers?
Where is this going to end? Lyla—
It's not happening, just forget it.
And that's final.
Do I detect a little tension in the air?
You all need to be submerged for a while.
It's only because there are things we don't understand yet.
Mermaid things.
Well, that's to be expected.
You don't have your moon rings yet.
You completed your mermaid studies.
You were initiated into the pod.
Top of my class.
So you know how Mako works?
How the full moon affects it,
including the entrance to the land tunnel?
I didn't even know there was one...
so whatever it is, it's not something
you should be meddling with, either.
Come on. What are you waiting for?
What's taking her so long?
She's sulking, of course.
I'm not waiting around for that.
It's okay. Shh!
Get off, Poseidon.
I need to look in there.
Shoo.
Top of her class.
I knew she'd have one.
I'm only borrowing it.
Oh, what is it, Poseidon? Shh.
Zac? You still here?
I'm just about to leave.
I'm coming with you.
But I thought— Nixie said—
I make up my own mind.
Cool. We can go in Cam's tinny.
We can't. We'll get hit by the spray.
So I got a tail.
It's not like I have to hide it from you anymore.
No, but it'd be way faster if you swam, right?
What's the hurry?
Now that you're coming it's only right that we go together.
It's fine, I can handle a boat by myself, you know.
You have to swim.
Why?
Well, because, um...
if we figure out what happened to you,
then it's the last time you'll have a tail.
Maybe. Good.
I'll take the boat, meet you there in an hour.
Looks pretty spooky even in daylight.
Why do you camp here, then?
Well, I never thought that
before the weird stuff that changed me.
That only happens when there's a full moon.
I hope.
Yeah.
So it's cool.
We stick together and look after each other, okay?
I can't remember which way I walked from here.
Hey, Zac.
We should go this way.
How do you know?
It just...
looks like someone's been through there.
Really?
I guess.
It's worth a try, right?
Hey, I think this is the spot.
So where's the cave that you went into?
I don't know.
Maybe it wasn't here.
No, trust your first instincts.
They're usually right.
This is the place.
That's where it happened.
But I don't understand.
There should be an entrance here.
How long have we been waiting for Lyla now?
Four tops, three skirts and a jacket's worth.
Face it, she's not coming.
She's so stubborn.
As soon as she gets an idea in her head, that's it.
Nothing stops her.
You don't actually think she'd try it, do you?
To open the land entrance another way?
How? You're the only one who has a moon ring.
This is Lyla.
Like you said...
Nothing stops her.
Well, we're not getting through that in a hurry.
Why don't you try your powers on it?
Nothing's happening. Keep trying.
Keep going.
Did I do that?
How else could it have happened?
What do we do now?
We enter.
No!
This isn't good.
What if I use my powers again? Yeah.
It's not working.
We're trapped.
Have you seen Lyla?
She left about an hour ago.
Did she say where she was going or what she was doing?
She wanted information about Mako.
I told you. I knew it!
What is this all about?
Lyla wanted to borrow my moon ring.
And I said no.
My moon ring's gone!
We're gonna get it back, don't worry.
How did she know you even had one?
She was asking about the land entrance
to the moon pool on Mako.
Is that what it's for?
She thought she'd use a moon ring to try and open it.
She's gone there with Zac.
I warned her not to meddle with things she doesn't understand.
She mustn't use that moon ring on Mako.
We have to stop her.
Yeah, well, if we suddenly turn up on Mako,
what's Zac gonna think?
"How did you get here?"
Of course you can borrow my boat.
Where are you going?
Mako Island.
Oh, cool.
I finish my shift in half an hour. I'll take you.
You? Yeah.
There's a couple of tricks to starting the outboard motor.
Well, we'll figure it out.
It's no problem. I haven't been there in ages.
We really need to go right now.
Oh. Maybe I can get off early.
I'll ask Carly to cover for me. No.
You're too responsible for that.
You can't let your customers down.
We'll get the motor started. We'll be fine.
You can come next time.
Okay, if you say so.
Here. Thanks.
We'll be back in a couple hours.
Nope.
That's not gonna budge.
Sorry.
I guess I got us into a pretty tight spot.
No, it's— it's my fault.
How do you figure that?
I encouraged you and I chose to come.
Why did you?
You couldn't come by yourself.
What if something happened to you?
You worry about me that much?
There's gotta be another way out of here. Come on.
We're not really getting in this thing, are we?
No way.
We'd both be on the bottom flapping around with tails.
Great, so this is a waste of time?
Sirena, this isn't going to work
as a cover story for how we got to Mako.
I've got a plan, all right?
There's no way out.
What is that?
I've seen it before.
But it was glowing like this bright light was behind it.
When I touched it, the floor must've opened up and I fell.
This vanished?
What are you doing?
Don't worry, I've got you. In case it happens again.
Here goes nothing.
You're affecting it.
It's glowing because of you.
I remember it did that when I touched it.
What is it?
I don't know.
Do you remember this?
No.
It's almost like it's alive.
No, you'll get a tail.
Maybe even something worse.
What if we get sucked into the depths for good?
This is what I came for.
I have to find out what happened to me, Lyla.
Zac!
Come on!
Open up.
Are you sure this is the way Lyla described?
Yes.
No.
I don't know.
Wait. Didn't Zac and Cam
camp the night that he fell into the moon pool?
Yeah.
Well, this was a campfire.
That could be anyone's.
But...
Lyla mentioned a rock wall.
And this is the way to the volcano.
Zac!
Come back.
This has got to be it.
Well, if this is the land entrance,
it can only be opened by full moonlight.
And a moon ring, if she's right.
Yeah, well, why isn't it open now?
I don't know, but we have to find her.
I don't see anything.
But I hear something.
Zac! Come back!
Zac! Zac!
Can you hear me?
Zac!
Hurry! We don't have much time.
Zac! Zac!
I saw something in there. Like that symbol.
We have to get out of here now!
What are you guys doing here?
We're looking for you.
What was that?
It's the tunnel I told you about.
It's gone. It's the one I went into
the night everything happened to me.
I opened it before.
Why can't I do it now?
Who knows? Let's just go.
I wanna know what that thing I saw was.
Whatever it was, we can't go back in now.
That was way too close.
But I wanna know what it all means.
It means this is a dangerous place and we're lucky.
I'll swim back. I'll meet you there.
Nice ring.
There was water all around me.
High above and deep below. I can't explain it.
This object was floating in the distance.
I should have kept going. I should have taken it.
Maybe you weren't meant to.
Why do you say that?
Just a thought.
I'm gonna go back and I'm gonna get it this time.
No. But I have to do it.
Just don't go back without me. It's too dangerous. Promise?
Okay, I promise.
Hey, we make a pretty good team.
Can I get you something to drink?
No, I should be going.
You sure? I could talk about this for hours.
I've got some things I need to do.
Bye.
Got something of mine?
Sorry.
If you ever steal from me again, you won't be welcome here.
I promise I won't.
You were banished for a reason.
There are forces out there no one understands.
Me included.
It's bad enough that the boy and the island are connected.
You're just putting yourselves and him in danger.
Thanks, guys.
If you hadn't shown up, we'd still be stuck in there.
For some reason, the moon ring didn't work inside the tunnel.
Maybe it only works in a place that can receive full moonlight.
Lyla...
we warned you against using it.
That doesn't usually stop me.
Guess I should have known that by now.
But what does all of this mean?
Some strange object in a massive pool?
I don't know.
One thing's for sure.
It's pulling at Zac and it's gonna keep doing that
with or without our help.
He's gonna keep getting drawn back to Mako.
We can't stop it.