0:00:00 > 0:00:00- .
0:00:02 > 0:00:04- Octonots, to your stations.
0:00:06 > 0:00:07- Cwrwgl.
0:00:08 > 0:00:09- Harri.
0:00:09 > 0:00:11- Pegwn.
0:00:37 > 0:00:38- Explore.
0:00:38 > 0:00:39- Rescue.
0:00:39 > 0:00:40- Rescue.- - Protect!
0:00:45 > 0:00:48- The Octonots - and the Cookie Cutter Sharks
0:00:56 > 0:00:59- We're connected and ready to go, - Cap.
0:00:59 > 0:01:02- We'll test the Octocam.
0:01:10 > 0:01:13- Is the Octocam working, Cregynnog?
0:01:13 > 0:01:15- Yes, Captain.
0:01:15 > 0:01:18- I can see the hermit crab clearly.
0:01:18 > 0:01:20- No one's ever studied - this part of the sea.
0:01:21 > 0:01:24- We can film the creatures - that live here.
0:01:25 > 0:01:28- Great. Cwrwgl out. - Good work, Octonots.
0:01:28 > 0:01:30- Back to the Octopod.
0:01:38 > 0:01:40- CWRWGL WHISTLES
0:01:46 > 0:01:47- CLUNK
0:01:47 > 0:01:49- What was that?
0:01:51 > 0:01:53- Nothing.
0:01:59 > 0:02:00- CLUNK
0:02:04 > 0:02:05- CLUNK
0:02:05 > 0:02:08- That sound is coming - from outside the sub.
0:02:08 > 0:02:11- Is there anyone out there?
0:02:11 > 0:02:14- No one but those small black fish.
0:02:15 > 0:02:17- Does the sub need some attention?
0:02:18 > 0:02:20- We'll have a look when we've docked.
0:02:22 > 0:02:24- There you go.
0:02:24 > 0:02:27- These fish biscuits are delicious.
0:02:27 > 0:02:29- Incredible.
0:02:29 > 0:02:33- How many starfish - are travelling together here?
0:02:33 > 0:02:36- There's one, two... Huh?
0:02:40 > 0:02:41- Come back.
0:02:41 > 0:02:45- Captain. - Something's wrong with the Octocam.
0:02:45 > 0:02:46- I'll see what I can do.
0:02:49 > 0:02:50- It's not working.
0:02:50 > 0:02:52- It's not working.- - Hm. Strange.
0:02:52 > 0:02:54- It was working when we left it.
0:02:55 > 0:02:59- Cap, come here. You need - to see this with your own eyes.
0:03:00 > 0:03:03- Three perfectly-rounded holes - in the sub.
0:03:04 > 0:03:06- What could make holes like that?
0:03:06 > 0:03:09- Not what, Captain - who!
0:03:10 > 0:03:11- Look.
0:03:11 > 0:03:12- Look.- - A full set of teeth.
0:03:13 > 0:03:16- Strong enough to bite - a piece of the sub.
0:03:16 > 0:03:20- First, damage to the sub. - Now, the Octocam's broken.
0:03:20 > 0:03:22- Something's going on here.
0:03:22 > 0:03:24- Ira, sound the Octoalert.
0:03:25 > 0:03:27- To the diving bay.
0:03:37 > 0:03:42- Something's wrong with the Octocam. - We have to go back.
0:03:42 > 0:03:48- I'll fix the holes before you can - say munch those crunchy carrots!
0:03:48 > 0:03:51- Thanks. Cregynnog, - find out who owns those teeth.
0:03:52 > 0:03:54- We'll inspect the Octocam.
0:03:54 > 0:03:58- What kind of animal - would leave its teeth behind?
0:03:58 > 0:04:02- I'll get to the tooth. - I mean, the truth.
0:04:04 > 0:04:07- Yes. - This is a mystery we must solve.
0:04:07 > 0:04:10- Harri, Pegwn, to the sub.
0:04:15 > 0:04:17- It's definitely not working.
0:04:17 > 0:04:20- It's definitely not working.- - Nothing at all.
0:04:22 > 0:04:26- Here's why. - Three holes in the rubber cable.
0:04:26 > 0:04:28- Like the holes in the sub.
0:04:28 > 0:04:31- Three more holes. And here.
0:04:32 > 0:04:34- Who's biting our equipment?
0:04:34 > 0:04:36- Who's biting our equipment?- - Hm?
0:04:38 > 0:04:41- Captain, Harri, - another set of teeth.
0:04:42 > 0:04:44- Where?
0:04:44 > 0:04:47- Where?- - Huh? They were here just now.
0:04:49 > 0:04:50- Look.
0:04:52 > 0:04:56- Gone. There's nothing here - apart from those tiny fish.
0:04:56 > 0:05:00- It's as if someone's playing tricks - on us before disappearing.
0:05:01 > 0:05:02- Who'd do that?
0:05:02 > 0:05:05- I know, - but it'd be better if I didn't.
0:05:05 > 0:05:07- It's the tri-toothed terror.
0:05:08 > 0:05:09- The tri-toothed what?
0:05:09 > 0:05:11- The tri-toothed what?- - The tri-toothed terror.
0:05:11 > 0:05:16- It's a huge creature - with three huge sharp teeth.
0:05:16 > 0:05:19- It bites ships into tiny pieces...
0:05:19 > 0:05:22- ..before disappearing out of sight.
0:05:22 > 0:05:26- Do you think the - tri-toothed terror would follow us?
0:05:27 > 0:05:30- I don't think - it's a tri-toothed terror.
0:05:30 > 0:05:33- If he didn't make those holes, - what did?
0:05:34 > 0:05:37- DEEP DISTANT LAUGHTER
0:05:37 > 0:05:38- What's that?
0:05:44 > 0:05:48- A blue whale. Has he seen something - that could solve the mystery?
0:05:48 > 0:05:50- Excuse me.
0:05:52 > 0:05:54- Why are you laughing?
0:05:56 > 0:05:59- Something's tickling me...
0:05:59 > 0:06:01- ..but I'm not sure what.
0:06:01 > 0:06:03- I want it to stop.
0:06:03 > 0:06:05- Down by my tail.
0:06:09 > 0:06:11- We've seen these marks before.
0:06:11 > 0:06:13- We've seen these marks before.- - Ooh, it's under my chin now.
0:06:17 > 0:06:21- The tri-toothed terror - must be nearby but where?
0:06:22 > 0:06:24- I have to go.
0:06:24 > 0:06:27- Hold on tight.
0:06:40 > 0:06:43- That was an exciting journey.
0:06:43 > 0:06:46- I'd like to know - who was tickling me.
0:06:47 > 0:06:51- The creature making you laugh - is creating some bother for us.
0:06:51 > 0:06:54- It's left more circular marks - on your skin.
0:06:55 > 0:07:00- Don't worry. The Octonots - will find him and stop him.
0:07:02 > 0:07:04- Too big. Too small.
0:07:05 > 0:07:08- Too thin. No. No. No.
0:07:08 > 0:07:09- Steady on.
0:07:11 > 0:07:12- This one.
0:07:13 > 0:07:15- I know where these teeth came from.
0:07:16 > 0:07:17- Well done.
0:07:17 > 0:07:19- Well done.- - It's a cookie cutter shark.
0:07:20 > 0:07:23- It buries its teeth - in a whale's blubber...
0:07:23 > 0:07:26- ..leaving perfectly-rounded holes.
0:07:27 > 0:07:30- They went after the blue whale - to bite its blubber.
0:07:31 > 0:07:34- Why did they bite - the Octocam's cables?
0:07:34 > 0:07:39- Confusion. They thought - the soft rubber cables was blubber.
0:07:39 > 0:07:40- Rubber.
0:07:40 > 0:07:41- Rubber.- - For blubber!
0:07:41 > 0:07:47- We have to catch one and ask them - to stop biting our cables.
0:07:48 > 0:07:49- I have an idea.
0:07:50 > 0:07:52- Cwrwgl calling Ira. - We need your help.
0:08:02 > 0:08:06- Hey, Cap. - One large whale-sized balloon?
0:08:06 > 0:08:08- Thanks, Ira.
0:08:08 > 0:08:11- We'll leave it near the Octocam - and then hide.
0:08:23 > 0:08:24- SNORING
0:08:24 > 0:08:25- SNORING- - Huh?
0:08:39 > 0:08:42- Stay where you are, - you nasty nibblers.
0:08:46 > 0:08:47- We've caught you.
0:08:48 > 0:08:50- I didn't do it. I wasn't there.
0:08:50 > 0:08:53- You bit holes in our equipment - and ruined them.
0:08:54 > 0:08:56- Oh, that. - We're cookie cutter sharks.
0:08:56 > 0:08:59- We thought your equipment was food.
0:08:59 > 0:09:01- We had a nip. Sorry.
0:09:01 > 0:09:03- Sorry, sorry.
0:09:04 > 0:09:06- How do you hide all the time?
0:09:09 > 0:09:11- Clamming up, are you?
0:09:11 > 0:09:13- Clamming up, are you?- - OK then. We'll show you how we hide.
0:09:16 > 0:09:18- Your bellies glow.
0:09:18 > 0:09:22- When we look up at them, - they blend into the sunlight.
0:09:23 > 0:09:25- We can only see the black marks.
0:09:25 > 0:09:27- It makes them look like tiny fish.
0:09:28 > 0:09:31- That's why no one sees you - down here.
0:09:31 > 0:09:33- You know our secret now.
0:09:33 > 0:09:35- We can't trick you again.
0:09:36 > 0:09:39- Why did you leave your teeth - in the sub?
0:09:39 > 0:09:41- They come out by the row.
0:09:41 > 0:09:44- Then they grow back quickly.
0:09:44 > 0:09:48- The teeth that disappeared? - I put them down and they were gone.
0:09:49 > 0:09:51- I ate them.
0:09:51 > 0:09:53- You ate your own teeth?
0:09:53 > 0:09:55- That doesn't sound healthy.
0:09:55 > 0:09:57- That doesn't sound healthy.- - It is for a cookie cutter shark.
0:09:57 > 0:09:59- They're packed with vitamins.
0:10:00 > 0:10:05- We've solved the mystery - but please don't bite our equipment.
0:10:05 > 0:10:09- OK then, but it would be nice - to have a bite to eat.
0:10:11 > 0:10:13- I have an idea.
0:10:19 > 0:10:22- These fish biscuits - are better than rubber.
0:10:23 > 0:10:25- That's the tooth!
0:10:25 > 0:10:26- That's the tooth!- - The truth!
0:10:29 > 0:10:33- No one can resist a bite - of your fish biscuits.
0:10:35 > 0:10:37- I wouldn't say no to one myself.
0:10:37 > 0:10:39- I wouldn't say no to one myself.- - You're not the only one.
0:10:40 > 0:10:42- THEY ALL LAUGH
0:10:43 > 0:10:44- Can I have another?
0:10:58 > 0:10:58- .