Lewis couldn't think.

What was going on?

Why had Rikki just disappeared in front of him and where were the others?

There was nothing in the cavern to explain and Lewis was getting aggravated.

For all he knew, the girls could be in terrible danger.

Rikki said something though…the moon pool… Lewis thought back deeply, trying to link together the facts.

He ran to the edge of the moon pool and peered deep into it's depths.

Where was his reflection?

Lewis touched the water.

The surface rippled as normal and an image started to form.

Lewis stared as three girls faces appeared on the surface of the water.

It was a watery image but clear enough for Lewis to recognise Cleo, Emma and Rikki's faces.

They seemed half relaxed, half urgent, looking as though they were trapped.

"Lewis? Lewis are you there?" Cleo asked.

"Yeah, where are you Cleo?"

"Lewis listen" Emma took over.

"I am!" Lewis replied, leaning slightly to make sure they heard him.

This was bizarre, Lewis could now see them, but they were communicating with him through the moon pool.

How?

Where were they?

"Lewis, we need you" Emma pleaded, her voice echoing as if it was coming from all around him, even though it was coming straight from the water.

"Why? Where are you?!" Lewis exclaimed urgently.

"Why? We're trapped in the heart of the moon pool!" Rikki shouted.

Lewis had to pause to let that sink in.

Heart of the moon pool…

"How did you get in there? You saw the moon?" Lewis questioned, he needed to get to the bottom of this.

Lewis had no idea what they meant by the heart of the moon pool.

They'd never encountered a full moon where the heart of the moon pool was involved.

"We heard it, the song of the full moon" Emma explained calmly, even though the calmness wasn't displayed in her eyes.

"What song?…Oh yeah…but how do I get you out?" Lewis asked.

"Get in the water" Rikki said.

Get in the water, how will that help?

"These are new shorts…" Lewis mumbled to himself, vainly.

"LEWIS!" Rikki folded her arms.

"Ok, ok…" Lewis breathed. "I'll do it, stay there, I'm coming for you guys"

The girls beamed at him and faded away.

Lewis watched as Cleo's grateful smile faded away into the blue of the water.

The image had completely gone.

Lewis gritted his teeth.

Cleo and his best friends were in danger and he had to help them.

He pulled his shoes swiftly off and placed them by the side of the pool.

Lewis psyched himself up and stepped up onto the rock slab.

He took a deep breath and leapt into the water.

It was like jumping into another world.

All around him was blue, just like the moon pool naturally was but it had a different feel to it.

Lewis didn't focusing on breathing at all as he dove down to the bottom of the moon pool.

It was sandy and normal.

Where's the heart?

He scanned the large walls of the moon pool, his clothes weighing him down.

He couldn't see anything like a secret chamber.

All he could see were the mangroves around the entrance.

Lewis swam out of the underwater cave, the moonlight illuminating the way.

He swam round the side of the island mangroves and found himself confronted with numerous giant corals.

He gazed around and saw a small crevice.

Lewis didn't hesitate, he was running out of oxygen and didn't have anytime to lose if he was going to rescue Cleo, Emma and Rikki.

He squeezed through, almost getting his drifting hair caught on the jagged opening.

Lewis was cautious as he swam through the cave, he had no way of knowing what creatures inhabited the tunnel.

Or what forces were lurking…

Light was visible as the tunnel served upwards towards the surface of the water.

He pulled himself to the surface frantically, his lungs clenched, deprived of much needed oxygen.

Lewis sucked down the air as he raised his head from the salty water.

It was good to be able to breath again.

Is this the heart of the moon pool? Lewis asked himself, looking around the small cave in awe.

It was tiny, the pool Lewis was stationary in, was only a 1/6 of the cave.

The rest was sand and rock, like a miniature moon pool.

Lewis got out of the corner side pool and shook himself off.

"Right…" he breathed, ready now to find his friends.

"Girls?" He called, confidently hoping they were here.

Nothing.

Oh come on! This is another cave on Mako island, it has to be the heart of the moon pool!

"GIRLS!?" Lewis yelled, his voice bouncing off the walls.

"Lewis!" Cleo, Emma and Rikki smiled.