0:00:03 > 0:00:05This is Alaska. It's the largest state in America
0:00:05 > 0:00:08and the scale of it is simply impossible to comprehend.
0:00:08 > 0:00:11You can fly for hours and below you see nothing but lakes,
0:00:11 > 0:00:13mountains and forests.
0:00:15 > 0:00:17This is the last frontier.
0:00:20 > 0:00:21My name's Steve Backshall...
0:00:25 > 0:00:27..and I'm on a mission, searching for...
0:00:27 > 0:00:29deadly places,
0:00:29 > 0:00:30deadly adventures
0:00:30 > 0:00:32and deadly animals.
0:00:36 > 0:00:38And you're coming with me every step of the way.
0:00:43 > 0:00:44Argh!
0:00:50 > 0:00:55Alaska. Our pole-to-pole journey continues south.
0:00:58 > 0:01:02We are now beyond the Arctic Circle and in a much more temperate world.
0:01:04 > 0:01:08In the Alaskan seas we'll encounter and ocean giant...
0:01:08 > 0:01:09Breathtaking.
0:01:14 > 0:01:16..see an American icon like never before...
0:01:16 > 0:01:17Yes.
0:01:19 > 0:01:23..then go in search of a dark water monster.
0:01:23 > 0:01:24What was that?
0:01:29 > 0:01:31But we begin with something new.
0:01:33 > 0:01:37Not an animal but a feature of Alaska itself.
0:01:37 > 0:01:38A deadly force of nature...
0:01:41 > 0:01:43..of such size and scale
0:01:43 > 0:01:46the only way to appreciate it is from the sky.
0:01:48 > 0:01:52We are pulling up at what appears to be a vast white-water river
0:01:52 > 0:01:54but this is in fact a river of ice.
0:01:54 > 0:01:55It's a glacier.
0:01:59 > 0:02:03Constantly moving glaciers have the power to sculpt mountains,
0:02:03 > 0:02:07carve valleys and give birth to giant icebergs.
0:02:09 > 0:02:11Made up of millions of tonnes of ice,
0:02:11 > 0:02:14they plough through everything in their path.
0:02:22 > 0:02:24Their ponderous progress is most evident
0:02:24 > 0:02:27when you feel the ice beneath your feet.
0:02:27 > 0:02:30As the vast weight shifts, it creaks and groans
0:02:30 > 0:02:33and you can feel its devastating potential.
0:02:33 > 0:02:37Though it looks like one big, white, solid object,
0:02:37 > 0:02:41A glacier is almost a living, moving thing.
0:02:41 > 0:02:44All of this forms way up high in the mountains
0:02:44 > 0:02:47in a place called the ice field,
0:02:47 > 0:02:50so snow will accumulate over centuries and centuries
0:02:50 > 0:02:53and it gets compacted by its own weight
0:02:53 > 0:02:58and turns into ice and that ice starts to flow down like a river,
0:02:58 > 0:03:01forming these incredible ice-falls and great sheets of ice.
0:03:04 > 0:03:07Some part of the glacier are more dynamic than others.
0:03:07 > 0:03:10We're seeking out the most dramatic.
0:03:10 > 0:03:12All of the ice on the surface of the glacier
0:03:12 > 0:03:14is constantly heated by the sun
0:03:14 > 0:03:17and forms little streams like this,
0:03:17 > 0:03:20which eventually run into big rivers.
0:03:20 > 0:03:23Now, these rivers create an enormous amount of water
0:03:23 > 0:03:25and that water has to go somewhere.
0:03:25 > 0:03:29Eventually, it finds a weak point in the glacier
0:03:29 > 0:03:31and it burrows down into a whirlpool...
0:03:33 > 0:03:35..called a moulin.
0:03:35 > 0:03:38This is the gateway to the guts of the glacier.
0:03:38 > 0:03:42It's an incredibly frightening place and believe it or not,
0:03:42 > 0:03:43that's where we're going.
0:03:45 > 0:03:48We set up a system of ropes, secured by ice screws.
0:03:51 > 0:03:54These will be my lifeline into the moulin.
0:03:57 > 0:04:00OK, I'm all prepared for my trip into the underworld.
0:04:00 > 0:04:02I've got my waterproof suit on,
0:04:02 > 0:04:05I've also got this camera
0:04:05 > 0:04:07which we usually use for filming underwater
0:04:07 > 0:04:10and as soon as I get over the edge and I'm into the waterfall
0:04:10 > 0:04:12I'll lose contact with the rest of the crew,
0:04:12 > 0:04:15so I've got a radio to be able to talk to them
0:04:15 > 0:04:17and I can't put it off any longer.
0:04:17 > 0:04:20This is going to be seriously cold.
0:04:20 > 0:04:24That is the understatement of the century.
0:04:24 > 0:04:27The glacial meltwater thunders into the blue depths
0:04:27 > 0:04:30and in a few minutes it's going to be crashing over me.
0:04:35 > 0:04:38I'm going to get absolutely hammered here.
0:04:42 > 0:04:44Whoa.
0:04:44 > 0:04:46This looks absolutely brutal.
0:04:46 > 0:04:49I've got two separate falls coming in.
0:04:49 > 0:04:51The big one over there I'm going to be able to stay clear of
0:04:51 > 0:04:53for most of the way.
0:04:53 > 0:04:54That one's going to hit me
0:04:54 > 0:04:56within a few metres...
0:04:57 > 0:05:01..and the water is going to numb my brain and my fingers
0:05:01 > 0:05:04and my whole body will start to shut down really quickly.
0:05:09 > 0:05:12Glaciers may look like a static alien world
0:05:12 > 0:05:15but they are constantly moving and changing.
0:05:15 > 0:05:18Nobody has ever ventured into this unique moulin
0:05:18 > 0:05:20and we don't know what we'll find below.
0:05:29 > 0:05:32This would have to be one of the most hostile places
0:05:32 > 0:05:34you can ever be in.
0:05:35 > 0:05:40This is a place that human beings are simply not supposed to be.
0:05:42 > 0:05:45I'm looking down
0:05:45 > 0:05:47to the very bottom of a glacier,
0:05:47 > 0:05:52an enormous, moving river of ice.
0:05:52 > 0:05:55If I didn't have my drysuit,
0:05:55 > 0:05:57I wouldn't last seconds here.
0:05:58 > 0:06:01The water is only just above freezing
0:06:01 > 0:06:03and thundering down around my ears.
0:06:10 > 0:06:12Steve, are you OK down there?
0:06:12 > 0:06:14Uh...
0:06:14 > 0:06:15Uh!
0:06:17 > 0:06:19I'm not sure if he's going to hear it.
0:06:20 > 0:06:22Uh.
0:06:22 > 0:06:24Oh, my fingers!
0:06:24 > 0:06:26I can't feel my fingers.
0:06:26 > 0:06:27Is he coming back, Johnny?
0:06:32 > 0:06:33Oh!
0:06:33 > 0:06:34Whoa!
0:06:37 > 0:06:40It's such an incredibly beautiful place...
0:06:41 > 0:06:45..but it's almost too frightening and too overwhelming to appreciate.
0:06:49 > 0:06:51I don't think I should go on any further.
0:06:51 > 0:06:53I think it'd just be too dangerous.
0:06:56 > 0:06:58And look at all that water thundering down below me.
0:07:00 > 0:07:02I think, if I tried to head down there...
0:07:04 > 0:07:05..I wouldn't make it.
0:07:09 > 0:07:13OK, I need to start climbing back up now.
0:07:17 > 0:07:19One last ledge.
0:07:20 > 0:07:22But the water has frozen my fingers solid.
0:07:22 > 0:07:25I can't get back onto the ropes to start climbing out.
0:07:34 > 0:07:38But finally I get it together and start to escape the moulin.
0:07:39 > 0:07:41Come on!
0:07:54 > 0:08:00That was probably the most hardcore thing I've ever done on Deadly.
0:08:00 > 0:08:03It's going to be hours before I can feel my fingers again.
0:08:05 > 0:08:07I am
0:08:07 > 0:08:08totally
0:08:08 > 0:08:10smashed...
0:08:11 > 0:08:14..but there's no doubt that
0:08:14 > 0:08:17places like moulins
0:08:17 > 0:08:19are a lethal environment.
0:08:21 > 0:08:23Definitely deadly.
0:08:33 > 0:08:35More familiar territory now.
0:08:35 > 0:08:38We're ocean-bound in search of an Alaskan giant.
0:08:41 > 0:08:43For the next few days we're going to be out at sea in search
0:08:43 > 0:08:47of one of the largest predators on the planet - the humpback whale.
0:08:50 > 0:08:54Humpbacks are among the most massive creatures on earth.
0:08:54 > 0:08:56They can get to be over 15m in length,
0:08:56 > 0:09:01weigh 40 tonnes, and eat a tonne and a half of small fish,
0:09:01 > 0:09:03crustaceans and plankton in a day.
0:09:06 > 0:09:09The humpbacks span the planet in their annual migrations and
0:09:09 > 0:09:13move massive distances to find food so we have to cover a lot of ground.
0:09:16 > 0:09:19The crew are eagle-eyed and ready for action.
0:09:20 > 0:09:21Some of the time.
0:09:26 > 0:09:30We eventually reach an area where the whales have been seen feeding
0:09:30 > 0:09:34but the engines of our boat could put the whales off their game
0:09:34 > 0:09:36so I slide into a silent sea kayak.
0:09:39 > 0:09:42We've found ourselves an absolutely perfect spot.
0:09:42 > 0:09:46We're in a channel with the water completely flat calm.
0:09:46 > 0:09:48The opportunity couldn't be better.
0:09:50 > 0:09:53All we need now is for the whales to play ball.
0:09:57 > 0:10:01After a while. I put down my paddle and wait.
0:10:12 > 0:10:14Goodness. Whoa!
0:10:17 > 0:10:20And in no time at all I am surrounded,
0:10:20 > 0:10:24with whales everywhere, spouting as they surface.
0:10:24 > 0:10:27The water looks like it's alive with cannons firing.
0:10:32 > 0:10:35Oh, my goodness.
0:10:37 > 0:10:40It's a crazy feeling. I know that there are
0:10:40 > 0:10:42at least ten animals...
0:10:43 > 0:10:46..each of which could weigh 30 or even 40 tonnes
0:10:46 > 0:10:50and they're beneath me right now and yet they totally disappear.
0:10:50 > 0:10:53The second they go beneath the surface, they're invisible.
0:10:56 > 0:10:59But there are uninvited guests-
0:10:59 > 0:11:01Steller sea lions.
0:11:01 > 0:11:04There are hundreds of them, in a mood for mischief.
0:11:05 > 0:11:07This is out of this world.
0:11:07 > 0:11:11The sea lions seem to see the whales as a big plaything
0:11:11 > 0:11:14which can be irritating, even to these huge beasts.
0:11:16 > 0:11:19They're so playful.
0:11:19 > 0:11:22And these animals are here for the same reasons as the whales are -
0:11:22 > 0:11:24food.
0:11:24 > 0:11:27There's an abundance of fish here, primarily herring,
0:11:27 > 0:11:32but also the salmon that are waiting to head up-river to spawn
0:11:32 > 0:11:36and these Steller sea lions have got food in abundance.
0:11:36 > 0:11:39So much food that they can just afford to spend
0:11:39 > 0:11:41an enormous amount of time mucking about.
0:11:43 > 0:11:47Fun as this is for us, the whales are being pestered at the surface
0:11:47 > 0:11:50and keep diving, put off their feeding.
0:11:50 > 0:11:55We'd really hoped to film the whales in full predatory glory
0:11:55 > 0:11:57so decide to change location.
0:11:59 > 0:12:04Several hours away, we have an unexpected, jaw-dropping encounter.
0:12:09 > 0:12:12Oh, look at that!
0:12:12 > 0:12:14Whoa!
0:12:17 > 0:12:20I don't quite believe what I've just seen.
0:12:20 > 0:12:25That is an animal that weighs probably more than a fire truck
0:12:25 > 0:12:27and it's just propelled itself out of the water,
0:12:27 > 0:12:30mere metres from the side of our boat.
0:12:30 > 0:12:35The shower that came off it as it hit the water was phenomenal.
0:12:35 > 0:12:38This whale is in a playful mood.
0:12:40 > 0:12:43After each gargantuan breach,
0:12:43 > 0:12:46the whale swims down to gain momentum then breaches again.
0:12:51 > 0:12:54Scientists are still unsure as to why whales breach.
0:12:54 > 0:12:57It certainly helps to shed dead skin and get rid of parasites.
0:12:57 > 0:13:02It may also be a display and have a role in communication.
0:13:02 > 0:13:05But it seems as if this exuberant whale is just having fun.
0:13:10 > 0:13:13It's only when you're this close,
0:13:13 > 0:13:17that you get any real sense of the size and scale of humpback whales.
0:13:17 > 0:13:20Most of the time all you see is that distinctive hump shape
0:13:20 > 0:13:23as they just come out of the water breathing,
0:13:23 > 0:13:25but when they breach, you can see the whole thing
0:13:25 > 0:13:28and it is simply enormous.
0:13:29 > 0:13:33And it's far from finished.
0:13:41 > 0:13:43Breathtaking.
0:13:43 > 0:13:45Absolutely breathtaking.
0:13:46 > 0:13:51Despite its size, with just a couple of sweeps of that mighty tail,
0:13:51 > 0:13:53it can propel itself clear of the water.
0:13:59 > 0:14:03I've never had a breach that close to me before.
0:14:05 > 0:14:08Extraordinary, absolutely extraordinary.
0:14:08 > 0:14:11Humpbacks are gentle giants
0:14:11 > 0:14:15but consume as much as a tonne and a half of other animals in a day
0:14:15 > 0:14:17which makes them worthy of the deadly name.
0:14:32 > 0:14:36Alaska remains one of my favourite places on the continent.
0:14:36 > 0:14:37Goodness!
0:14:37 > 0:14:40But it's time to continue our journey south -
0:14:40 > 0:14:43the Canadian province of British Columbia.
0:14:43 > 0:14:48Just off the coast, Vancouver Island is a wild, rugged place,
0:14:48 > 0:14:50but some of its finest and most unusual wildlife
0:14:50 > 0:14:52is found beneath the waves.
0:14:52 > 0:14:57It's also one of the only places you can see a little-known predator.
0:14:57 > 0:15:00It's called the sixgill shark.
0:15:00 > 0:15:02They inhabit the darkest depths of our oceans,
0:15:02 > 0:15:05over a mile below the surface.
0:15:05 > 0:15:06We know little about their secret lives.
0:15:06 > 0:15:09But they certainly scavenge carcases like dead whales
0:15:09 > 0:15:11that sink down from above.
0:15:11 > 0:15:13They even eat each other.
0:15:14 > 0:15:16They're rarely seen and we're short on time
0:15:16 > 0:15:19so it will be a true challenge...
0:15:19 > 0:15:20but...
0:15:22 > 0:15:26..we've got this remarkable bit of Deadly technology.
0:15:26 > 0:15:30Effectively what this is is an underwater CCTV camera.
0:15:30 > 0:15:34It's going to sit on the bottom right next to our bait
0:15:34 > 0:15:38and we can see what's going on at the surface using this tablet.
0:15:38 > 0:15:40We can switch on the lights,
0:15:40 > 0:15:43so even in the dead of night we'll still be able to film
0:15:43 > 0:15:45and hopefully this will be triggered by a shark
0:15:45 > 0:15:47coming in to check out our bait.
0:15:47 > 0:15:49We want to leave our remote camera in place,
0:15:49 > 0:15:51scanning the depths.
0:15:59 > 0:16:02We install the camera at 18m.
0:16:06 > 0:16:08This is one of the few places on earth
0:16:08 > 0:16:11that sixgills visit these shallower waters.
0:16:15 > 0:16:17Like all sharks, their sense of smell
0:16:17 > 0:16:20will draw them to food from a great distance.
0:16:22 > 0:16:24This is our bait here.
0:16:24 > 0:16:27These crates are filled with old fish heads
0:16:27 > 0:16:31and lots of blood is floating off into the water.
0:16:31 > 0:16:35You can't see it, but the sharks can smell it.
0:16:35 > 0:16:40Hopefully, this camera here is going to see them as they come in.
0:16:42 > 0:16:45While the remote camera is our best chance of a sighting,
0:16:45 > 0:16:49we can still dream of a face-to-face encounter
0:16:49 > 0:16:51so we set off to explore.
0:16:52 > 0:16:55And you don't have to peer into too many holes
0:16:55 > 0:16:57before something peers back at you.
0:16:59 > 0:17:02Oh, wow! Yes, yes, yes! I see it!
0:17:02 > 0:17:04Underneath this ledge
0:17:04 > 0:17:09is the massive, imposing head of a wolf eel.
0:17:09 > 0:17:13And in this bag, I've got some nice stinky chicken
0:17:13 > 0:17:16to try and entice it out into the open.
0:17:17 > 0:17:20Ideally, I'd have some kind of tongs or tweezers or something,
0:17:20 > 0:17:26because...I really don't want to be having my fingers snapped.
0:17:28 > 0:17:31That big, troll-like head belongs to a fish that feeds on
0:17:31 > 0:17:36the spikiest of all foods - the sea urchin.
0:17:36 > 0:17:39They crack them open to get at the soft insides.
0:17:44 > 0:17:46OK, it's interested.
0:17:47 > 0:17:50Come on out, big fella.
0:17:50 > 0:17:52No! It's been stolen!
0:17:54 > 0:17:57But hopefully that's got his attention enough
0:17:57 > 0:18:00to come out into the open because this is
0:18:00 > 0:18:03one of the most magnificent creatures of these pacific seas.
0:18:03 > 0:18:07There he is! Oh, fantastic.
0:18:07 > 0:18:10Completely out in the open.
0:18:11 > 0:18:12Wonderful stuff.
0:18:14 > 0:18:17Though worlds apart from a tropical coral reef,
0:18:17 > 0:18:20these temperate waters brim with colour and life...
0:18:21 > 0:18:23Look at all those fish.
0:18:30 > 0:18:32..some of which is beyond bizarre.
0:18:34 > 0:18:37Oh, this is brilliant. Come over and look at this.
0:18:39 > 0:18:41It's a giant nudibranch.
0:18:43 > 0:18:47It's actually a kind of sea snail or sea slug.
0:18:47 > 0:18:48It's quite closely related
0:18:48 > 0:18:51to the slugs and snails you find in your back garden.
0:18:51 > 0:18:55But could not be more different.
0:18:55 > 0:18:58It's absolutely dazzling, incredibly flamboyant.
0:19:01 > 0:19:05They move quite slowly but they are actually predatory.
0:19:08 > 0:19:11A magical example of murder in miniature.
0:19:17 > 0:19:20These nudibranch hunt tube anemones on the sea floor.
0:19:47 > 0:19:51Predators really don't get any stranger than this.
0:19:56 > 0:19:57As the dive comes to an end,
0:19:57 > 0:20:00we know our remote camera will never sleep...
0:20:04 > 0:20:08..and can keep its electronic eye on the goings-on down below.
0:20:08 > 0:20:11Here's hoping a sixgill swims by.
0:20:15 > 0:20:18There's so much life down there.
0:20:18 > 0:20:22Unbelievable colours. Real animal oddities.
0:20:22 > 0:20:24But, as yet, not quote the one we're looking for.
0:20:29 > 0:20:31We dig in for a long wait,
0:20:31 > 0:20:34making sure someone is always watching the screen.
0:20:37 > 0:20:41But all our bait is attracting is some small rock fish.
0:20:46 > 0:20:53After several hours of staring, sleeping and snoring,
0:20:53 > 0:20:56we decide to leave the camera to do its job and head inland.
0:21:00 > 0:21:03The team and I are going to try out another new piece of filming
0:21:03 > 0:21:07technology to show you a Canadian icon like never before.
0:21:09 > 0:21:12This part of the world is paradise for birds
0:21:12 > 0:21:15and this being Deadly, we're going for birds of prey.
0:21:15 > 0:21:19This is a bald eagle, a bird of legendary power,
0:21:19 > 0:21:24a potent force in the mythology and legends of the continent.
0:21:24 > 0:21:27But no matter how familiar this bird is,
0:21:27 > 0:21:29there's always something new to learn.
0:21:33 > 0:21:36We've come to the Pacific North West Raptor Centre
0:21:36 > 0:21:39to see their predatory prowess with fresh eyes.
0:21:42 > 0:21:45It is one of the most spectacular birds you'll see in the whole world
0:21:45 > 0:21:48and one of the most powerful birds of prey.
0:21:48 > 0:21:52And most of the power is down here, in the talons.
0:21:52 > 0:21:55They're strong, curved and perfect
0:21:55 > 0:21:57for catching a hold of things like fish.
0:21:57 > 0:22:00He also has... I'll come in quite carefully,
0:22:00 > 0:22:03cos he's not entirely used to me yet.
0:22:03 > 0:22:06Now he's showing off one of his primary weapons, that beak,
0:22:06 > 0:22:10and I'm trying to keep it as far away from my face as possible.
0:22:10 > 0:22:12And the cutting edge of the beak
0:22:12 > 0:22:14is seriously as sharp as a carving knife.
0:22:14 > 0:22:18Now these birds can kill prey as large as geese,
0:22:18 > 0:22:20but far more often they'll just steal food,
0:22:20 > 0:22:22even off other bald eagles.
0:22:22 > 0:22:27Now, I could... Now, I could talk about this bird all day long,
0:22:27 > 0:22:30but I think it'd be much better if we showed you him in action.
0:22:33 > 0:22:36So, to see a bald eagle at their best,
0:22:36 > 0:22:38we've got a bit of Deadly technology -
0:22:38 > 0:22:40this. It's a paddling pool,
0:22:40 > 0:22:43but a paddling pool with a very special addition.
0:22:43 > 0:22:45Running all the way round the outside
0:22:45 > 0:22:47we've got a circle of very small cameras
0:22:47 > 0:22:52and they're focused on a sweet spot around about here.
0:22:52 > 0:22:55We're going to put in this - it kind of looks like a little flip-flop,
0:22:55 > 0:22:58but this is a lure and it has here some salmon.
0:23:00 > 0:23:03When our bald eagle takes the lure,
0:23:03 > 0:23:05just as it would snatch a fish in the wild,
0:23:05 > 0:23:07all the cameras will fire off
0:23:07 > 0:23:10and we'll be able to analyse its strike from 360 degrees.
0:23:12 > 0:23:16Our high-speed camera will slow the moment down frame by frame.
0:23:19 > 0:23:23OK, so the lure has gone in, it's right slap bang in the sweet spot.
0:23:23 > 0:23:25HANDLER WHISTLES
0:23:28 > 0:23:32Yes, he's gone! Look at that! No, he's really gone.
0:23:32 > 0:23:34HE LAUGHS
0:23:34 > 0:23:36Erm... Let's try again.
0:23:36 > 0:23:39Man away.
0:23:39 > 0:23:43Just going to wait until I can see I've got his attention.
0:23:43 > 0:23:44Right, he's seen it.
0:23:51 > 0:23:53Yes!
0:23:53 > 0:23:57Fantastic! That could not have been more perfect.
0:23:57 > 0:23:59That was exactly the pounce I was hoping for.
0:24:01 > 0:24:06Our high-speed camera shows the eagle hit the lure bang on.
0:24:06 > 0:24:09So, let's view back the time slice.
0:24:11 > 0:24:14It's been a long day, but we've got all the results finished here,
0:24:14 > 0:24:17downloaded and we can start to watch them properly.
0:24:17 > 0:24:23So this is our bald eagle skimming just over the top of those cameras.
0:24:23 > 0:24:26Absolutely incredible!
0:24:26 > 0:24:32For the first time ever, we can see an eagle striking from 360 degrees.
0:24:32 > 0:24:37It arches its wings upwards like a parachute to slow its approach.
0:24:37 > 0:24:41The legs thrust forward, talons as long as my thumb extend,
0:24:41 > 0:24:44aimed like stabbing daggers into the target.
0:24:50 > 0:24:54And if that was a fish, even a really big fish like a salmon,
0:24:54 > 0:24:57it would all be over in a millisecond.
0:24:57 > 0:24:58This is happening so quickly.
0:25:03 > 0:25:07In slow motion, you can see that as the eagle approaches,
0:25:07 > 0:25:11its head steadies, eyes lock on to the target
0:25:11 > 0:25:14and never leave it until the talons are engaged.
0:25:14 > 0:25:18Once the target's caught, the eagle needs to get airborne immediately
0:25:18 > 0:25:21to avoid crashing into the water.
0:25:21 > 0:25:24It's also now carrying extra weight.
0:25:24 > 0:25:27The broad wings drive down, giving lift.
0:25:28 > 0:25:32Front talons grip the prize, rear talons stab in, securing the kill.
0:25:39 > 0:25:41I've never seen anything like this before.
0:25:41 > 0:25:44This is just out of this world.
0:25:45 > 0:25:48This is a true filming first.
0:25:48 > 0:25:51Such a strike is over in the blink of an eye.
0:25:51 > 0:25:52Seen from every angle,
0:25:52 > 0:25:55you can really appreciate quite how much is going on.
0:25:55 > 0:25:58And all driven by deadly instinct.
0:26:04 > 0:26:06While we've been busy elsewhere,
0:26:06 > 0:26:09our aquatic technology has been tirelessly filming.
0:26:12 > 0:26:15We returned to the chilly coast to check back the footage.
0:26:15 > 0:26:20Could we have managed to capture on camera the elusive sixgill shark?
0:26:24 > 0:26:29So, let's have look and see what we've got.
0:26:29 > 0:26:33Wow! There's so much activity.
0:26:35 > 0:26:37Wow! Look at that!
0:26:37 > 0:26:41This is one of our giant nudibranchs, the same ones we saw on
0:26:41 > 0:26:44the sea bed, but it's swimming right up in the water column.
0:26:44 > 0:26:47That is beautiful!
0:26:47 > 0:26:50This camera is set to automatically record
0:26:50 > 0:26:52every time something swims by,
0:26:52 > 0:26:55but it's being triggered almost constantly.
0:26:55 > 0:27:00The whole place is buzzing with life, day and night.
0:27:00 > 0:27:03The sunflower stars are out in force,
0:27:03 > 0:27:07one using its tubed feet to taste our camera.
0:27:07 > 0:27:07Rockfish by the dozen...all coming in to check out the bait box.
0:27:07 > 0:27:12Rockfish by the dozen...all coming in to check out the bait box.
0:27:12 > 0:27:15It really goes to show quite what's going on
0:27:15 > 0:27:18in the darkness below us that we just don't see.
0:27:20 > 0:27:22What was that?!
0:27:22 > 0:27:24That was definitely a shark tail!
0:27:26 > 0:27:30It's a sixgill! We've got a sixgill shark!
0:27:35 > 0:27:38Fantastic!
0:27:38 > 0:27:42It looks like quite a long animal, actually.
0:27:42 > 0:27:45This is a really privileged glimpse into the life of an animal
0:27:45 > 0:27:49that normally we would never have the opportunity to see.
0:27:49 > 0:27:52This awesome animal that's been around since before the dinosaurs
0:27:52 > 0:27:55is for me one of the most sinister, creepy,
0:27:55 > 0:27:58but exciting animals on Earth.
0:27:58 > 0:28:01And, I reckon, sixgills are deadly.
0:28:06 > 0:28:10The Pacific Northwest has shown us some grand adventures.
0:28:12 > 0:28:17We've filmed familiar animals in ways they've never been seen before
0:28:17 > 0:28:21and caught a tantalising glimpse of a sea monster.
0:28:22 > 0:28:25Join us next time as we continue ever southwards.
0:28:29 > 0:28:33We go on the trail of wolves in sub-zero snows...
0:28:33 > 0:28:35Her heart's going crazy.
0:28:35 > 0:28:38..search for an animal straight from hell...
0:28:38 > 0:28:39Oh!
0:28:41 > 0:28:46..and, as the journey warms up, get immersed in a mega swarm.
0:28:46 > 0:28:47Argh!