0:00:29 > 0:00:31Huh! What was...?
0:00:40 > 0:00:44'You've reached the Nektons, please leave a message.'
0:00:44 > 0:00:48Will, it's Ken, I know what I saw sounds crazy...
0:00:48 > 0:00:52it was so fast... faster than any fish. But I swear...
0:00:52 > 0:00:53it was human!
0:00:55 > 0:00:59My family are explorers. We have been for generations.
0:00:59 > 0:01:01While others look up to the stars,
0:01:01 > 0:01:03we know there are an infinite number of things that
0:01:03 > 0:01:05shine in the darkness below.
0:01:05 > 0:01:09There are things lurking in the seas that long ago vanished into myth.
0:01:09 > 0:01:11My family are explorers.
0:01:11 > 0:01:13And we explore The Deep!
0:01:24 > 0:01:25'You have to come!
0:01:25 > 0:01:28'Whatever it is that's down there, you need to see it!'
0:01:31 > 0:01:33I tried to call back, but no answer.
0:01:33 > 0:01:35I haven't heard from Ken in years,
0:01:35 > 0:01:37but he's not the easily spooked kind.
0:01:38 > 0:01:41I know that area.
0:01:41 > 0:01:44There's no sinkhole, it's a gigantic kelp bed.
0:01:44 > 0:01:46Found it.
0:01:47 > 0:01:50- Oh, it WAS a kelp bed. - And now it's died off.
0:01:50 > 0:01:52Good job, climate change.
0:01:52 > 0:01:53That's a blue hole.
0:01:53 > 0:01:56Congratulations, Captain Obvious.
0:01:56 > 0:01:58I mean, a new blue hole is unexplored territory.
0:01:58 > 0:02:02A home of undiscovered ecosystems! Species found nowhere else on Earth!
0:02:02 > 0:02:05Hmm. What is your brain doing?
0:02:05 > 0:02:07Mysterious humans, living underwater?
0:02:07 > 0:02:09There can only be one explanation.
0:02:09 > 0:02:11You can't be serious, Ant.
0:02:11 > 0:02:13Mermaids!
0:02:13 > 0:02:16There's no such thing as mermaids!
0:02:18 > 0:02:22I see something. Definitely some kind of boat.
0:02:22 > 0:02:24Can you see Ken?
0:02:24 > 0:02:25I see...
0:02:26 > 0:02:28..Nereus?
0:02:28 > 0:02:31When I heard Ken's message, I thought I'd help.
0:02:31 > 0:02:34I was vaguely in the area.
0:02:34 > 0:02:36What do you mean, "vaguely in the area"?
0:02:36 > 0:02:39You heard a private phone call? How?
0:02:39 > 0:02:41And where's Ken?
0:02:41 > 0:02:42Safe, William.
0:02:42 > 0:02:45I sent him home with some, er, associates.
0:02:45 > 0:02:47Poor man needed a rest.
0:02:47 > 0:02:51This sinkhole is far too precarious if what he saw is real.
0:02:55 > 0:02:59Wow. That's a terrifying...
0:02:59 > 0:03:00blur(!)
0:03:00 > 0:03:03No, no, no, no, no, you can, you can see the human-ish shape!
0:03:03 > 0:03:07- Uh-huh. - But is it man? Or mer?
0:03:08 > 0:03:10Have you got nitrogen on the brain?
0:03:10 > 0:03:11OK, monsters of the deep? Sure.
0:03:11 > 0:03:15But I am not going searching for mermaids.
0:03:15 > 0:03:17That photo is proof of something down there,
0:03:17 > 0:03:19but we won't know what until we look.
0:03:19 > 0:03:21- Yes! Search party!
0:03:21 > 0:03:24My third, no, second favourite type of party!
0:03:24 > 0:03:28Before you dive, I'll need to see the Chronicle of the Deep.
0:03:28 > 0:03:30There's a legend I half remember...
0:03:34 > 0:03:38Ah, here, the hole in the sea that hides a mystery...
0:03:38 > 0:03:40Not exactly specific.
0:03:40 > 0:03:43Does it say anything about mermaids? That one looks like a tail.
0:03:43 > 0:03:44Alas, no.
0:03:44 > 0:03:49I think what it's saying is, "the abyss stares back".
0:03:49 > 0:03:52Because mermaids traditionally live in very deep water, right?
0:03:52 > 0:03:53In the abyss?
0:03:53 > 0:03:55What is the obsession?
0:03:55 > 0:03:58Do you want to be lured to a watery grave?
0:03:58 > 0:04:00Because that's what mermaids do.
0:04:00 > 0:04:03- Oh, so you admit they exist? - Argh!
0:04:03 > 0:04:06I've seen this page hundreds of times.
0:04:06 > 0:04:08I could never figure out what the image was.
0:04:08 > 0:04:12The kelp bed must have hidden it for 100 years.
0:04:12 > 0:04:13400 years.
0:04:13 > 0:04:15According to the Chronicle,
0:04:15 > 0:04:18the last person went into the hole in the 1600s.
0:04:18 > 0:04:22Wait, so you can read Lemurian?
0:04:22 > 0:04:25I...make educated guesses.
0:04:25 > 0:04:28- Can you guess what this says? - Hmm.
0:04:28 > 0:04:32The writer reports that the impossible dwells below
0:04:32 > 0:04:35and vows never to return.
0:04:35 > 0:04:37That. Is. Amazing!
0:04:37 > 0:04:41You just don't get the concept of impending doom, do you?
0:04:41 > 0:04:45Ready for the most awesome adventure, Jeffrey?
0:04:45 > 0:04:48The kind of adventure where nobody goes too deep.
0:04:48 > 0:04:49And where you stay...
0:04:51 > 0:04:52..together.
0:05:06 > 0:05:07Wow!
0:05:07 > 0:05:09Those teeth.
0:05:09 > 0:05:11That couldn't possibly be an Enchodus?
0:05:11 > 0:05:15A sabre-toothed herring! They went extinct millions of years ago.
0:05:16 > 0:05:20Congratulations, you've just discovered a Lazarus species.
0:05:24 > 0:05:28A living fossil. Ha! I'm officially impressed.
0:05:28 > 0:05:29Come on, let's go deeper.
0:05:38 > 0:05:43Jeffrey, that's your species! Pseudanthias bicolor!
0:05:43 > 0:05:45Huh! He shouldn't be in these waters.
0:05:45 > 0:05:49Ha-ha! He likes you! Now play nice with your new friend.
0:05:49 > 0:05:51He's a long way from home.
0:05:51 > 0:05:53Hey! Come back!
0:05:53 > 0:05:54Ant! Stop!
0:05:54 > 0:05:55Wait! Please!
0:05:55 > 0:05:58You're descending too quickly! Stop now!
0:05:58 > 0:06:00What?
0:06:02 > 0:06:03What happened? Ant?
0:06:03 > 0:06:07I saw someone down there. Swimming faster than any human can!
0:06:07 > 0:06:09Scales? Trident? Tail?
0:06:09 > 0:06:12Mock all you want. It was about my size.
0:06:12 > 0:06:13It looked like a kid.
0:06:13 > 0:06:15A child? Alone down here?
0:06:16 > 0:06:19Any ideas, keeper of secrets?
0:06:19 > 0:06:23None. But there are no other dive boats for 100km.
0:06:27 > 0:06:30I'm going back to the Aronnax for the Rover so we can explore deeper.
0:06:30 > 0:06:32In the meantime, stay...
0:06:32 > 0:06:33'Together. We promise.'
0:06:39 > 0:06:42No sign of any diver of any species.
0:06:42 > 0:06:44I'm not making it up. You saw it, right, Jeffrey?
0:06:44 > 0:06:47Jeffrey?
0:06:47 > 0:06:49Jeffrey, where are you?
0:06:49 > 0:06:50He's gone!
0:06:50 > 0:06:51We have to go deeper to find him!
0:06:51 > 0:06:54Not until your mother gets back with the Rover.
0:06:54 > 0:06:55Please, Dad.
0:06:55 > 0:06:56I'm sorry...
0:06:56 > 0:06:58He's my best friend!
0:07:01 > 0:07:03Kaiko, do you read me?
0:07:03 > 0:07:04'Loud and clear!'
0:07:04 > 0:07:06We're going a little deeper to find Jeffrey.
0:07:06 > 0:07:07Yes!
0:07:07 > 0:07:09'Keep your eyes peeled.
0:07:09 > 0:07:13'Remember, the abyss stares back.'
0:07:13 > 0:07:16Yeah, sure, man of mystery!
0:07:16 > 0:07:18Jeffrey?
0:07:18 > 0:07:19Jeffrey!
0:07:29 > 0:07:33There! That was definitely human, but way faster!
0:07:33 > 0:07:35No way. How?
0:07:36 > 0:07:38I saw one too!
0:07:38 > 0:07:40Huh! Now who's crazy?
0:07:40 > 0:07:42BOTH: Wait for me here!
0:07:42 > 0:07:43Dad? Fontaine?
0:07:44 > 0:07:47Jeffrey? Where are you?
0:07:47 > 0:07:49This is not the time to play hide and seek.
0:07:53 > 0:07:55This diver is too fast.
0:07:55 > 0:07:57You were an Olympic swimmer, Dad.
0:07:57 > 0:07:59How is this person faster than you?
0:07:59 > 0:08:02I'll ask them when I catch them.
0:08:05 > 0:08:08Ant, Fontaine.
0:08:08 > 0:08:10- We've found another one.- One what?
0:08:10 > 0:08:12Another Lemurian symbol.
0:08:23 > 0:08:25Ah...guys?
0:08:25 > 0:08:28I think my diver just disappeared.
0:08:28 > 0:08:29On a scale of weird and creepy,
0:08:29 > 0:08:32this place is rapidly going off the chart.
0:08:32 > 0:08:34Ah, don't say that, Fontaine!
0:08:34 > 0:08:36Jeffrey's alone out there.
0:08:39 > 0:08:40Argh!
0:09:01 > 0:09:05Wow! I saw the diver.
0:09:05 > 0:09:08It was me - I mean, I was him. It was Ant!
0:09:08 > 0:09:11I had an Ant to Ant encounter!
0:09:11 > 0:09:13Two Ants? That sounds horrifying.
0:09:13 > 0:09:15I mean it, Fontaine!
0:09:15 > 0:09:16I'm back with the Rover -
0:09:16 > 0:09:19and I don't like the sound of this other Ant.
0:09:19 > 0:09:21Everyone up to the surface, now.
0:09:21 > 0:09:24Ah, we've been down here too long.
0:09:24 > 0:09:26Some of us more than others...
0:09:55 > 0:09:59Argh. The same eyes, the same nose, ah, the same everything!
0:09:59 > 0:10:03Do I have a twin? Am I adopted?
0:10:03 > 0:10:05How's your vision?
0:10:05 > 0:10:06Follow my finger with your eyes.
0:10:06 > 0:10:08Maybe I'm a mermaid.
0:10:08 > 0:10:10The rare two-legged kind.
0:10:10 > 0:10:13How else could there be another Ant down there? What could this mean?
0:10:13 > 0:10:15Is the other Ant asking his mer-family
0:10:15 > 0:10:17exactly the same question at the mer-colony?
0:10:17 > 0:10:19The abyss stares back.
0:10:20 > 0:10:22I hate it when you're all mysterious.
0:10:22 > 0:10:26Ooh, are you feeling nauseous? Cold? How's your vision?
0:10:26 > 0:10:31No, no, and fine. They saw divers too. Fontaine's disappeared.
0:10:31 > 0:10:32Why am I the crazy one?
0:10:32 > 0:10:37Four words. Ant to Ant encounter.
0:10:37 > 0:10:40Jeffrey! Huh, he's still down there!
0:10:40 > 0:10:44Don't make me put you in a cage, little brother. Sit.
0:10:44 > 0:10:47You mentioned a Lemurian symbol?
0:10:47 > 0:10:49Ah. That explains why you're here.
0:10:49 > 0:10:52You knew it was down there.
0:10:52 > 0:10:55- Not at all. But I might be of help.
0:10:59 > 0:11:02The same symbol you've found so many times before.
0:11:02 > 0:11:04- What does it mean, finding it here?
0:11:04 > 0:11:09That I don't know. But rest assured, it does have meaning.
0:11:09 > 0:11:12But that symbol must be thousands of years old.
0:11:12 > 0:11:146,000, to be precise.
0:11:14 > 0:11:17And you're saying whatever it was that freaked out those
0:11:17 > 0:11:19- old explorers might still be down there?- I don't care.
0:11:19 > 0:11:23I'm not letting Jeffrey face sea monsters on his own.
0:11:23 > 0:11:24None of us want that.
0:11:24 > 0:11:27Exactly! Nektons, onwards!
0:11:27 > 0:11:29Um, that's down.
0:11:29 > 0:11:31Downwards!
0:11:34 > 0:11:37I'll admit I was somewhat wrong about the divers...
0:11:37 > 0:11:38Ha!
0:11:38 > 0:11:40But you have to admit there's a massive chance that you're
0:11:40 > 0:11:42just seeing things.
0:11:42 > 0:11:43He swam up to me, Fontaine!
0:11:43 > 0:11:46He was solid and looked exactly like me.
0:11:46 > 0:11:50I never knew I was that good-looking! I mean, I suspected...
0:11:50 > 0:11:53Definitely nitrogen on the brain.
0:11:55 > 0:11:57Jeffrey!
0:11:58 > 0:12:00And he's made some friends.
0:12:01 > 0:12:05Not that I want to judge, but Jeffrey's friends are...
0:12:05 > 0:12:07Super-friendly?
0:12:07 > 0:12:08I was going for creepy.
0:12:10 > 0:12:13Well, they sure seem to like him! They won't leave him alone.
0:12:17 > 0:12:19The other me! Ah, look there!
0:12:19 > 0:12:21Mom, go!
0:12:22 > 0:12:24Stay right there, Jeffrey!
0:12:29 > 0:12:31It can't be!
0:12:33 > 0:12:36No, what? How?
0:12:36 > 0:12:37Told ya.
0:12:39 > 0:12:41Hey, come back!
0:12:43 > 0:12:44Try to stay with him!
0:12:47 > 0:12:49How does he swim so fast?
0:12:49 > 0:12:52I have no idea! I've never seen anything like it!
0:12:55 > 0:12:57Kaiko, stop! It's a dead end.
0:13:01 > 0:13:04- That's...- Impossible?
0:13:04 > 0:13:05Where did he go?
0:13:08 > 0:13:11There's no way out of here!
0:13:11 > 0:13:14None of this makes sense. There must be another way out.
0:13:17 > 0:13:22What's that? Look!
0:13:24 > 0:13:25What!
0:13:25 > 0:13:26- Impossible!- Is that really...?
0:13:26 > 0:13:29Will, say something to them... uh, us...
0:13:29 > 0:13:31whoever they are!
0:13:31 > 0:13:33What do we say to ourselves?
0:13:33 > 0:13:35Someone just say something!
0:13:35 > 0:13:39I got this! Hey, me, how's it going?
0:13:39 > 0:13:41HIS VOICE ECHOES
0:13:41 > 0:13:43What was that?
0:13:57 > 0:13:59Let's get in and take a closer look!
0:13:59 > 0:14:02- Don't! We can't touch the other Rover!- Why not?
0:14:02 > 0:14:04There's only one explanation...
0:14:04 > 0:14:06Mind is open. Listening.
0:14:06 > 0:14:07Time travel.
0:14:07 > 0:14:10I take it all back. Bring on the mer-colony.
0:14:10 > 0:14:13- I want to believe. - We're seeing our future selves.
0:14:13 > 0:14:16If we touch them, the whole space-time continuum could collapse!
0:14:16 > 0:14:21No... "The abyss stares back". That was the clue.
0:14:22 > 0:14:26It's not time travel. It's like a mirror. I saw me.
0:14:26 > 0:14:29- Jeffrey saw Jeffrey. - And the divers were us?
0:14:29 > 0:14:33Back up a few brain cells. There were more than two Jeffreys.
0:14:33 > 0:14:36- And we all saw them. - No more half-truths, Nereus.
0:14:36 > 0:14:39Is there anything else the Chronicle says about this place?
0:14:39 > 0:14:41Nothing more than I've told you.
0:14:41 > 0:14:45Perhaps it's worth mentioning that the other Rover now looks alive?
0:14:47 > 0:14:49Actually, I don't want to see that.
0:14:49 > 0:14:52Can't we just turn off all the lights and pretend it's not there?
0:14:52 > 0:14:55- Ha! That's it! You're a genius, Ant! - Which one?
0:14:55 > 0:14:58Turn off the lights, Mum. Trust me.
0:14:58 > 0:15:02I hope you know what you're doing, Ant.
0:15:02 > 0:15:05Wait. Make sure you keep watching.
0:15:05 > 0:15:07Three, two, one!
0:15:10 > 0:15:12No way!
0:15:12 > 0:15:16Wow! Thaumoctopus mimicus.
0:15:16 > 0:15:19The mimic octopus, but not the one we know.
0:15:19 > 0:15:22An entirely new subspecies.
0:15:22 > 0:15:26Much more advanced than anything else on Earth. Remarkable.
0:15:26 > 0:15:30So, they've been down here, evolving for thousands of years?
0:15:30 > 0:15:32The normal mimic octopuses work alone, right?
0:15:32 > 0:15:34And can only copy animal shapes.
0:15:34 > 0:15:36But these are working together, in low light.
0:15:36 > 0:15:38They must have developed this behaviour
0:15:38 > 0:15:41as extreme camouflage to hide from predators.
0:15:41 > 0:15:43This must be their lair.
0:15:43 > 0:15:44FONTAINE SHUDDERS
0:15:44 > 0:15:47I really hate that word, "lair".
0:15:55 > 0:15:59- Hunting ground, perhaps? - Not helping!
0:15:59 > 0:16:01OK, as much as I'm enjoying the feeling of thousands
0:16:01 > 0:16:04of beady eyes watching us...
0:16:04 > 0:16:07Let's get out of here, slowly.
0:16:14 > 0:16:16OK, must have taken a wrong turn.
0:16:16 > 0:16:19No. That dead end wasn't there before.
0:16:45 > 0:16:49Another dead end. How many is that now?
0:16:49 > 0:16:51Try another tunnel!
0:16:51 > 0:16:55Kaiko, might I suggest you gun the engines?
0:16:57 > 0:16:59Hold on tight.
0:17:00 > 0:17:05- Look out!- Whoa!- Whoa!
0:17:05 > 0:17:08- Reverse. Quickly! - On it.
0:17:11 > 0:17:13Can rocks do that?
0:17:13 > 0:17:16The mimicry isn't a defence mechanism, it's predatory.
0:17:16 > 0:17:17They've herded us here.
0:17:17 > 0:17:18We are the prey.
0:17:18 > 0:17:21So, we're...trapped?
0:17:21 > 0:17:24They can't get to us inside the Rover. We're safe.
0:17:25 > 0:17:27Or not.
0:17:29 > 0:17:31This is incredible!
0:17:31 > 0:17:34- Ant, not the time for fish gazing! - Technically, they're cephalopods.
0:17:34 > 0:17:36Technically, they're trying to eat us!
0:17:36 > 0:17:40By pretending to be rocks! Ha! How amazing is that?
0:17:42 > 0:17:44It won't hold for much longer.
0:17:46 > 0:17:48Everyone, put on your scuba masks.
0:17:55 > 0:17:58Argh! Mum, do the electrics still work?
0:17:58 > 0:18:00- They do for now. Why? - The lights.
0:18:00 > 0:18:01Of course.
0:18:01 > 0:18:04We'll only have a few seconds to escape when the lights come back on.
0:18:04 > 0:18:06That's all I need.
0:18:09 > 0:18:11They're moving back.
0:18:11 > 0:18:14- Now!- That way! - I see it.
0:18:21 > 0:18:24- Another wall.- Not again!
0:18:25 > 0:18:27Jeffrey?
0:18:29 > 0:18:30Go!
0:18:32 > 0:18:34Oh, yeah!
0:18:37 > 0:18:41Jeffrey, tell me you lost your friends?
0:18:41 > 0:18:43That a boy!
0:18:43 > 0:18:46World Oceans Authority, this is the Nektons. Copy.
0:18:50 > 0:18:52Yes, we discovered a new blue hole.
0:18:52 > 0:18:54Sending coordinates now.
0:18:54 > 0:18:58Protected zone, no access, definitely no diving.
0:18:58 > 0:19:00Except to replant the kelp bed.
0:19:00 > 0:19:03I quite agree. No-one should ever encounter what's down there.
0:19:03 > 0:19:07Do you mean the octopus or the Lemurian symbol?
0:19:07 > 0:19:10Erm...perhaps both.
0:19:10 > 0:19:15You are in big trouble, Mr, swimming off alone like that!
0:19:15 > 0:19:17Ah, I can't stay mad at you.
0:19:21 > 0:19:25Ah! Hey! Off! I'm not your dinner!
0:19:25 > 0:19:27Urgh!
0:19:32 > 0:19:34It's OK, I've got you.
0:19:34 > 0:19:39Wait, how do I know for sure you're the real Jeffrey?
0:19:41 > 0:19:44I knew it was you. Good boy!
0:19:45 > 0:19:48Now, let's go home.
0:19:48 > 0:19:50As always, Nektons, a pleasure.
0:19:50 > 0:19:54Wait. If the Lemurian symbol is 6,000 years old,
0:19:54 > 0:19:56does that mean they had submersibles?
0:19:56 > 0:19:58That would be very advanced technology.
0:19:58 > 0:20:03Maybe the Lemurians were just very skilled at holding their breath?
0:20:03 > 0:20:04Like mermaids?
0:20:04 > 0:20:08Technically, we didn't disprove mermaids.
0:20:08 > 0:20:11The sea is deep and full of secrets.
0:20:11 > 0:20:16You're a very frustrating guy, you know that?
0:20:16 > 0:20:19Wait, Nereus, are you saying mermaids exist?
0:20:19 > 0:20:23Excellent question! Until next time...
0:20:23 > 0:20:25That's not an answer!
0:20:25 > 0:20:28Not even close to an answer!
0:20:28 > 0:20:30I know!