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These are the user uploaded subtitles that are being translated: 1 00:00:01,720 --> 00:00:04,917 DAVID TENNANT: The world's oceans are full of wonder... 2 00:00:06,360 --> 00:00:09,397 an alien world, waiting to be explored... 3 00:00:12,600 --> 00:00:15,433 a place of extraordinary Iifeforms 4 00:00:16,560 --> 00:00:18,755 with intriguing social lives 5 00:00:20,360 --> 00:00:22,828 and incredible intelligence. — DOLPHIN SQUEAKS 6 00:00:23,520 --> 00:00:27,308 To reveal their secrets, a hidden team goes undercover... 7 00:00:29,600 --> 00:00:31,591 spy creatures. 8 00:00:35,480 --> 00:00:38,916 The most innovative undersea robots in the world. 9 00:00:43,200 --> 00:00:46,033 They not only look like the animals they film 10 00:00:46,600 --> 00:00:50,115 they interact with them as no human can. 11 00:00:55,160 --> 00:00:57,071 Equipped with hidden cameras... 12 00:01:01,520 --> 00:01:04,478 they reveal their astonishing lives. 13 00:01:07,280 --> 00:01:10,670 As our spies join their undersea world... 14 00:01:11,560 --> 00:01:15,838 they shed light on some of the mysteries of the deep. 15 00:01:24,680 --> 00:01:26,636 On our spies' latest mission 16 00:01:26,720 --> 00:01:29,712 they reveal the extraordinary relationships 17 00:01:29,800 --> 00:01:33,190 that exist among the creatures of the ocean. 18 00:01:40,120 --> 00:01:43,829 In Australia, an astonishing event is undenNay. 19 00:01:47,480 --> 00:01:49,152 Cued by the full moon 20 00:01:49,400 --> 00:01:52,392 Spider crabs rise up from the abyss 21 00:01:52,480 --> 00:01:53,629 deep below. 22 00:01:56,800 --> 00:01:58,313 To reveal what's going on 23 00:01:58,680 --> 00:02:01,433 Spy Crab joins the march. 24 00:02:03,880 --> 00:02:06,838 Eight robotic legs give the traction it needs. 25 00:02:13,960 --> 00:02:17,999 Like the real thing, a hard shell protects its innards... 26 00:02:18,560 --> 00:02:20,790 in this case, a camera. 27 00:02:26,720 --> 00:02:28,153 Over the next two weeks 28 00:02:28,440 --> 00:02:29,873 thousands upon thousands 29 00:02:29,960 --> 00:02:32,793 of these usually solitary creatures will gather. 30 00:02:37,080 --> 00:02:40,390 Then... a hint at Why they're here. 31 00:02:41,760 --> 00:02:45,639 Spy Crab discovers that some are emerging from their shell. 32 00:02:52,720 --> 00:02:56,235 Squeezing out can take 15 minutes or more. 33 00:03:02,120 --> 00:03:04,111 Enzymes oil the process 34 00:03:04,400 --> 00:03:05,913 helping her slip away. 35 00:03:11,080 --> 00:03:13,071 Freed from what's become a prison 36 00:03:13,400 --> 00:03:15,118 she now has space to grow. 37 00:03:24,600 --> 00:03:27,273 Her new shell will take weeks to harden. 38 00:03:28,040 --> 00:03:31,350 Until then, she'll hide among the better protected. 39 00:03:33,920 --> 00:03:36,912 For now, she'll make do with our spy. 40 00:03:38,080 --> 00:03:40,196 She has good reason to hide away... 41 00:03:42,160 --> 00:03:44,469 There are plenty out to get her. 42 00:03:50,080 --> 00:03:53,834 A four—metre stingray can eat 50 crabs a day. 43 00:03:58,320 --> 00:04:01,232 They hoover up any who've lost their shell. 44 00:04:06,240 --> 00:04:09,312 Our spy becomes the crab's defender. 45 00:04:20,120 --> 00:04:22,395 The ray will look for an easier meal. 46 00:04:24,120 --> 00:04:26,634 Those with hard shells aren't worth the trouble. 47 00:04:28,920 --> 00:04:31,115 Males even stand and fight. 48 00:04:34,200 --> 00:04:37,237 Those with soft shells hide among the hordes. 49 00:04:42,600 --> 00:04:44,591 Despite their brave defenders 50 00:04:44,760 --> 00:04:46,591 the ray can hunt them down... 51 00:04:52,240 --> 00:04:56,199 It makes short work of extracting meat from shell. 52 00:04:59,480 --> 00:05:01,471 The crab—in—hiding makes her getaway. 53 00:05:04,800 --> 00:05:06,836 She needs to get lost in the crowd. 54 00:05:07,840 --> 00:05:10,718 The ray's victim is now an empty husk. 55 00:05:13,080 --> 00:05:15,674 But he's yet to have his 50—a—day... 56 00:05:17,960 --> 00:05:20,520 and the fleeing crab is still in the open. 57 00:05:30,960 --> 00:05:32,109 She's made it. 58 00:05:34,200 --> 00:05:36,509 Now to vanish among the masses... 59 00:05:41,680 --> 00:05:44,558 The greater the numbers, the harder it is for the ray. 60 00:05:53,000 --> 00:05:56,037 Those with hard shells form an armoured fortress 61 00:05:56,120 --> 00:05:58,270 with the soft-shelled hidden beneath. 62 00:06:07,120 --> 00:06:10,669 Left in the open, Spy Crab is now a sitting target. 63 00:06:14,920 --> 00:06:17,070 It gets the full death—ray treatment. 64 00:06:23,920 --> 00:06:27,310 A crab's—eye—view of an untimely end. 65 00:06:33,840 --> 00:06:35,796 But it's still live and kicking. 66 00:06:39,320 --> 00:06:40,673 It's not over yet. 67 00:06:48,600 --> 00:06:50,875 This time, the ray did it a favour. 68 00:06:55,120 --> 00:06:57,350 Back firmly on its own eight feet 69 00:06:57,800 --> 00:06:59,552 our spy heads to the fortress. 70 00:07:03,200 --> 00:07:05,873 It has a tower of crustaceans to climb. 71 00:07:10,200 --> 00:07:11,428 But there's no need. 72 00:07:12,680 --> 00:07:14,875 The crabs come to our spy. 73 00:07:24,360 --> 00:07:27,113 They create a shield of legs and armour. 74 00:07:29,000 --> 00:07:32,072 A living citadel built on sand... 75 00:07:33,440 --> 00:07:37,069 a brief monument to the strength of teamwork. 76 00:07:41,480 --> 00:07:45,029 Many sea creatures have found value in being together. 77 00:07:47,880 --> 00:07:51,316 Sharks may have a reputation as solitary killers 78 00:07:51,880 --> 00:07:53,996 but many are surprisingly social. 79 00:07:56,320 --> 00:08:00,313 Scalloped hammerheads are among the most sociable of all. 80 00:08:00,880 --> 00:08:02,598 They travel in their hundreds 81 00:08:02,680 --> 00:08:07,549 as they head to a remote island 300 miles off the Colombian coast. 82 00:08:09,960 --> 00:08:13,032 Today, they have a spy in their midst... 83 00:08:14,640 --> 00:08:18,679 a mechanical marvel, propelled by its shark—like tail. 84 00:08:21,760 --> 00:08:23,432 It hardly makes a sound 85 00:08:23,960 --> 00:08:27,714 vital when filming these surprisingly shy creatures. 86 00:08:32,920 --> 00:08:35,275 As well as a camera in each eye... 87 00:08:35,360 --> 00:08:37,316 it has another in its fin 88 00:08:37,560 --> 00:08:39,357 one with 360 vision. 89 00:08:46,280 --> 00:08:48,475 It can even film through its jaws. 90 00:08:56,280 --> 00:08:58,635 Our spy has much to reveal. 91 00:09:00,640 --> 00:09:01,959 Most are female 92 00:09:02,040 --> 00:09:05,077 with the largest in the middle and the smallest outside. 93 00:09:08,040 --> 00:09:11,350 Some even choose a travel companion for their journey. 94 00:09:18,720 --> 00:09:22,474 When they reach the island, they linger for a while. 95 00:09:26,480 --> 00:09:29,438 Malpelo is a magnetic anomaly. 96 00:09:33,080 --> 00:09:37,756 A place where the Earth's magnetic field is distorted by the rocks below. 97 00:09:39,560 --> 00:09:42,757 Hammerheads use the magnetic field as a compass 98 00:09:43,280 --> 00:09:45,714 so this place has unseen significance. 99 00:09:47,080 --> 00:09:50,152 They gather here, having returned from their feeding grounds. 100 00:09:56,600 --> 00:10:00,229 They are met by a surprising welcoming party. 101 00:10:02,000 --> 00:10:03,592 King angelfish... 102 00:10:03,840 --> 00:10:07,958 that provide a personal grooming service to these would—be killers. 103 00:10:12,960 --> 00:10:14,916 Wounds are attended to 104 00:10:15,120 --> 00:10:16,872 and parasites removed. 105 00:10:23,440 --> 00:10:25,749 As hammerheads feed in the deep ocean 106 00:10:25,840 --> 00:10:28,070 the angelfish here are safe. 107 00:10:30,560 --> 00:10:31,959 While they get a meal 108 00:10:32,040 --> 00:10:34,156 the sharks enjoy a makeover. 109 00:10:42,240 --> 00:10:43,958 In this topsy—turvy world 110 00:10:44,240 --> 00:10:46,515 fish seem to like sharks so much 111 00:10:46,880 --> 00:10:49,155 even our spy gains a following. 112 00:10:54,920 --> 00:10:58,230 Galapagos sharks also visit this undersea spa 113 00:10:58,720 --> 00:11:00,631 and receive the same warm welcome. 114 00:11:07,280 --> 00:11:10,113 Pilot fish cluster round the shark's jaws 115 00:11:10,400 --> 00:11:11,799 but are never taken. 116 00:11:14,600 --> 00:11:17,990 Instead, they benefit from the shark's protection. 117 00:11:20,160 --> 00:11:22,469 In return, they clean its teeth 118 00:11:22,680 --> 00:11:24,671 and gain a meal in the bargain. 119 00:11:27,640 --> 00:11:30,473 Flainbow chub are also shark—lovers. 120 00:11:40,760 --> 00:11:43,354 a trick thought to scrape off parasites. 121 00:11:51,240 --> 00:11:53,390 In this place of apparent harmony 122 00:11:53,880 --> 00:11:56,678 other intriguing relationships can be found. 123 00:12:01,080 --> 00:12:04,072 Spy Moray Eel joins the team. 124 00:12:06,080 --> 00:12:09,197 Like the real thing, it moves silently. 125 00:12:09,360 --> 00:12:13,114 Its mechanical spine creates the waves that propel its body. 126 00:12:18,360 --> 00:12:20,476 This is what it came to see... 127 00:12:23,400 --> 00:12:25,755 a community of moray eels. 128 00:12:28,400 --> 00:12:31,676 Despite their ghoulish looks and razor—sharp teeth 129 00:12:32,320 --> 00:12:34,072 they live in relative harmony. 130 00:12:40,680 --> 00:12:44,389 Spy Moray is here to study the partnership they share. 131 00:12:49,160 --> 00:12:52,596 Their unlikely allies are leather bass groupers. 132 00:13:01,160 --> 00:13:04,391 Our robotic Moray soon attracts their attention... 133 00:13:09,040 --> 00:13:12,350 for the fish are here to wake up the eels. 134 00:13:17,240 --> 00:13:19,879 Their snooze alarm could hardly be gentler. 135 00:13:22,000 --> 00:13:24,150 But, one by one... 136 00:13:24,880 --> 00:13:25,915 they stir. 137 00:13:28,440 --> 00:13:31,432 The groupers signal it's time to follow. 138 00:13:38,080 --> 00:13:40,150 With more gentle encouragement 139 00:13:40,520 --> 00:13:41,873 the eels oblige. 140 00:13:49,400 --> 00:13:53,279 To discover the reason, Spy Moray follows behind. 141 00:14:10,040 --> 00:14:13,715 They're heading to a spot the fish have checked out before. 142 00:14:24,160 --> 00:14:26,435 A place where smaller fish are hiding. 143 00:14:29,000 --> 00:14:31,150 A headstand marks the spot. 144 00:14:37,400 --> 00:14:38,992 A signal to the eels. 145 00:14:42,400 --> 00:14:45,198 They slink in where groupers can't 146 00:14:45,600 --> 00:14:47,158 and flush out the fish. 147 00:14:50,320 --> 00:14:51,230 There's one! 148 00:14:52,400 --> 00:14:53,435 Then another! 149 00:14:54,320 --> 00:14:55,389 And another! 150 00:14:57,000 --> 00:14:59,070 Most are too quick to catch. 151 00:15:06,320 --> 00:15:07,514 But in the scrum 152 00:15:07,600 --> 00:15:10,353 there's enough for both groupers and eels... 153 00:15:12,600 --> 00:15:14,556 despite the ones that get away. 154 00:15:17,400 --> 00:15:20,312 It's the perfect relationship, Where both gain. 155 00:15:21,720 --> 00:15:25,918 But Spy Moray is experiencing a technical malfunction. 156 00:15:27,000 --> 00:15:28,399 A loss of transmission... 157 00:15:29,880 --> 00:15:31,279 but still keeps filming. 158 00:15:34,120 --> 00:15:37,999 The groupers act as if our spy is part of the hunt... 159 00:15:39,280 --> 00:15:40,872 and has found something. 160 00:15:48,320 --> 00:15:51,790 Soon, our spy is completely smothered. 161 00:15:57,280 --> 00:15:58,872 But help has arrived. 162 00:16:04,240 --> 00:16:06,435 A spy to shepherd them away. 163 00:16:11,520 --> 00:16:13,670 The signal finally gets through. 164 00:16:15,160 --> 00:16:17,720 Like others in this undersea community 165 00:16:18,360 --> 00:16:20,828 our spies use teamwork too. 166 00:16:26,480 --> 00:16:30,871 In the oceans, working in partnership is surprisingly common. 167 00:16:32,680 --> 00:16:35,513 For bottlenose dolphins, it's a way of life. 168 00:16:36,800 --> 00:16:38,791 To strengthen the bonds between them 169 00:16:39,040 --> 00:16:41,110 they spend a lot of time at play. 170 00:16:45,760 --> 00:16:48,320 To find out who else might join their games 171 00:16:48,400 --> 00:16:50,755 Spy Pelican follows from above... 172 00:16:52,120 --> 00:16:54,998 while Spy Dolphin films from below. 173 00:16:55,080 --> 00:16:57,071 DOLPHINS SQUEAK 174 00:16:58,680 --> 00:17:03,071 Together, our roving spy creatures find a possible playmate... 175 00:17:07,720 --> 00:17:09,358 a southern right whale... 176 00:17:09,680 --> 00:17:11,477 DOLPHINS SQUEAK 177 00:17:12,520 --> 00:17:15,637 ...a species not known for its fun—loving lifestyle. 178 00:17:20,120 --> 00:17:22,111 It will need some coaxing... 179 00:17:24,120 --> 00:17:26,111 something to get it in the mood. 180 00:17:28,440 --> 00:17:30,908 Already, it seems to be working. 181 00:17:37,080 --> 00:17:38,593 Some show their belly 182 00:17:38,680 --> 00:17:40,113 a sign they want to play. 183 00:17:42,800 --> 00:17:43,915 DOLPHINS CLICK 184 00:17:46,680 --> 00:17:48,636 The whale even attempts a leap. 185 00:17:53,280 --> 00:17:55,555 They have the playmate they're after. 186 00:18:02,960 --> 00:18:05,110 But who can compete with a dolphin? 187 00:18:12,400 --> 00:18:13,833 There's no harm trying. 188 00:18:16,080 --> 00:18:18,275 DOLPHINS SQUEAK 189 00:18:36,600 --> 00:18:38,079 Another whale joins. 190 00:18:38,720 --> 00:18:40,153 It's now double the fun. 191 00:18:42,000 --> 00:18:44,560 DOLPHINS SQUEAK 192 00:18:57,000 --> 00:18:58,274 Still more arrive. 193 00:19:14,880 --> 00:19:17,314 But you can have too much of a good thing. 194 00:19:19,440 --> 00:19:23,069 Party over, the dolphins take their cue to leave. 195 00:19:26,200 --> 00:19:28,634 Spy Dolphin gives it one last go... 196 00:19:31,440 --> 00:19:32,759 but it's not the same. 197 00:19:37,400 --> 00:19:40,153 To discover that whales and dolphins play together 198 00:19:40,240 --> 00:19:41,593 is a revelation. 199 00:19:45,400 --> 00:19:46,435 For our spies 200 00:19:46,560 --> 00:19:49,472 there are always new surprises to uncover... 201 00:19:50,040 --> 00:19:51,758 WHALE SINGS 202 00:19:54,480 --> 00:19:57,472 ...and more astonishing relationships to find. 203 00:20:00,800 --> 00:20:03,872 DOLPHIN SQUEAKS AND CLICKS 204 00:20:04,640 --> 00:20:08,235 This pair of male dolphins are of different species. 205 00:20:12,240 --> 00:20:13,673 One is a bottlenose 206 00:20:13,760 --> 00:20:16,194 the other a rare humpback dolphin. 207 00:20:19,360 --> 00:20:21,237 They were forced from their family pod 208 00:20:21,320 --> 00:20:22,673 once they came of age. 209 00:20:22,960 --> 00:20:24,632 DOLPHINS SQUEAK 210 00:20:25,640 --> 00:20:27,232 Cast out and alone 211 00:20:27,560 --> 00:20:29,391 they found company in each other. 212 00:20:31,080 --> 00:20:33,719 Now, they go everywhere together. 213 00:20:34,440 --> 00:20:36,431 A true bond between friends. 214 00:20:36,800 --> 00:20:39,360 DOLPHINS SQUEAK AND CLICK 215 00:20:45,920 --> 00:20:48,229 But despite their close relationship 216 00:20:48,520 --> 00:20:50,112 they need to join a pod. 217 00:20:54,560 --> 00:20:58,189 A gang of male dolphins is just what they're looking for. 218 00:20:59,320 --> 00:21:02,153 DOLPHINS SQUEAK 219 00:21:07,760 --> 00:21:09,637 But these are bottlenose dolphins 220 00:21:09,720 --> 00:21:11,915 so the humpback must be cautious. 221 00:21:18,280 --> 00:21:20,191 His friend calls to the group 222 00:21:20,560 --> 00:21:22,915 a specific whistle unique to him. 223 00:21:23,160 --> 00:21:24,639 DOLPHIN WHISTLES 224 00:21:24,720 --> 00:21:27,075 The humpback follows as close as he dare 225 00:21:27,160 --> 00:21:29,230 anxious not to lose his companion. 226 00:21:35,160 --> 00:21:38,197 DOLPHIN SQUEAKS AND WHISTLES 227 00:21:41,520 --> 00:21:44,478 But pods are reluctant to accept newcomers 228 00:21:44,800 --> 00:21:47,189 and never those of a different species. 229 00:21:49,000 --> 00:21:51,070 They drive the humpback away. 230 00:21:57,560 --> 00:21:59,118 He won't be coming back. 231 00:22:00,000 --> 00:22:02,355 DOLPHINS SQUEAK 232 00:22:02,760 --> 00:22:04,637 HUMPBACK DOLPHIN CLICKS 233 00:22:05,560 --> 00:22:07,437 The bottlenose must decide 234 00:22:07,800 --> 00:22:09,472 does he follow his buddy 235 00:22:09,560 --> 00:22:11,118 or make new friends here? 236 00:22:13,960 --> 00:22:15,188 For the bottlenose 237 00:22:15,280 --> 00:22:17,635 it's clear where his destiny lies. 238 00:22:19,680 --> 00:22:22,148 It's not with the humpback dolphin. 239 00:22:24,600 --> 00:22:26,636 But joining the pod won't be easy. 240 00:22:32,120 --> 00:22:34,350 First, he must show he'll fit in. 241 00:22:39,680 --> 00:22:43,389 His ploy is to use the moves more often made by females. 242 00:22:44,120 --> 00:22:46,554 DOLPHINS SQUEAK 243 00:22:49,960 --> 00:22:51,757 It seems to do the trick. 244 00:23:00,320 --> 00:23:03,153 But now, he faces an initiation ceremony 245 00:23:03,880 --> 00:23:06,030 one all males must endure. 246 00:23:09,880 --> 00:23:13,475 Some rough—housing, to prove he's a worthy member of the gang. 247 00:23:16,640 --> 00:23:18,551 Over time, he'll be accepted 248 00:23:19,360 --> 00:23:21,999 and he's better in the pod than outside. 249 00:23:25,120 --> 00:23:27,680 For the humpback, it's a different story... 250 00:23:29,000 --> 00:23:31,070 he'll roam the ocean alone 251 00:23:31,560 --> 00:23:33,596 until he finds a pod of his own. 252 00:23:43,200 --> 00:23:45,668 Even sociable creatures like manatees 253 00:23:45,760 --> 00:23:48,274 can't always choose who they mix with. 254 00:23:51,640 --> 00:23:55,269 Spy Manatee is now fully accepted into the group. 255 00:23:57,760 --> 00:23:58,829 MANATEE SQUEAKS 256 00:24:00,160 --> 00:24:03,709 Its discovering that even here, they have friends they like 257 00:24:04,000 --> 00:24:07,037 and then there are the hangers—on. 258 00:24:10,400 --> 00:24:13,676 Latched onto her body are remora fish. 259 00:24:16,280 --> 00:24:20,068 Totally harmless, their relationship is extraordinary. 260 00:24:22,280 --> 00:24:24,874 They feed on skin flakes and parasites 261 00:24:24,960 --> 00:24:26,951 and whatever the manatee poos. 262 00:24:28,480 --> 00:24:29,754 What was once a fin 263 00:24:29,840 --> 00:24:32,513 has evolved into a suction pad on their head. 264 00:24:35,200 --> 00:24:36,315 As well as food 265 00:24:36,400 --> 00:24:38,550 the manatees provide an energy—saving way 266 00:24:38,640 --> 00:24:42,235 to get around while keeping water flowing through their gills. 267 00:25:04,000 --> 00:25:06,594 Those on top travel upside down. 268 00:25:10,640 --> 00:25:13,871 If they move to the belly, they're more easily shooed away. 269 00:25:16,520 --> 00:25:19,592 Even so, there's always another free ride. 270 00:25:23,200 --> 00:25:25,191 While remora can be a nuisance 271 00:25:25,640 --> 00:25:28,279 sergeant major fish are welcomed. 272 00:25:39,200 --> 00:25:41,839 The fish provide a cleaning sen/ice. 273 00:25:44,320 --> 00:25:47,312 They graze on the algae that grows on the skin. 274 00:26:01,880 --> 00:26:05,475 For a full body treatment, manatees strike a pose... 275 00:26:06,440 --> 00:26:09,591 letting the fish tackle those hard—to—reach places. 276 00:26:13,520 --> 00:26:16,432 It sends them into a state of bliss... 277 00:26:18,640 --> 00:26:20,312 until they nod off! 278 00:26:31,800 --> 00:26:33,233 The spa is popular. 279 00:26:33,440 --> 00:26:35,351 Everyone wants the full makeover. 280 00:26:44,800 --> 00:26:47,598 But not all the fish here are friendly. 281 00:26:51,160 --> 00:26:53,958 Nurse sharks patrol the coral heads 282 00:26:55,280 --> 00:26:58,078 while stingrays search the sandy seabed. 283 00:26:59,800 --> 00:27:03,110 These predators could be the ultimate test for our spy. 284 00:27:17,120 --> 00:27:20,396 Rays and sharks can detect electromagnetic signals. 285 00:27:25,160 --> 00:27:27,674 Spy Manatee has plenty of those! 286 00:27:33,960 --> 00:27:35,712 An exploratory nibble. 287 00:27:40,880 --> 00:27:42,757 But there's nothing here to be found. 288 00:27:46,800 --> 00:27:48,392 Like most of our spies 289 00:27:48,640 --> 00:27:51,234 Spy Manatee attracts the curious 290 00:27:51,840 --> 00:27:53,478 rather than the aggressive. 291 00:28:01,560 --> 00:28:06,953 In Indonesia, Spy hammerhead continues its own journey of discovery. 292 00:28:09,280 --> 00:28:11,794 It soon finds that across the ocean 293 00:28:11,880 --> 00:28:14,155 similar partnerships have evolved. 294 00:28:17,200 --> 00:28:20,715 Here, it's cleaner wrasse that take on cleaning duties. 295 00:28:22,680 --> 00:28:24,910 They even act as dental hygienists... 296 00:28:26,680 --> 00:28:28,796 with trapped food the reward. 297 00:28:33,240 --> 00:28:35,834 But these pearly whites have nothing to offer. 298 00:28:43,000 --> 00:28:45,992 An olive sea snake shows his inquisitive side. 299 00:28:47,960 --> 00:28:50,872 He's one of the most venomous snakes in the world. 300 00:28:53,080 --> 00:28:55,275 Today, he's on the hunt. 301 00:28:59,480 --> 00:29:02,119 He can hold his breath for up to two hours. 302 00:29:03,240 --> 00:29:05,117 Useful when searching for a meal. 303 00:29:15,240 --> 00:29:17,435 To catch them, he needs help. 304 00:29:18,920 --> 00:29:22,390 And on the reef, support is rarely far away. 305 00:29:24,160 --> 00:29:26,310 A female, who's also hunting. 306 00:29:36,360 --> 00:29:37,759 Like moray eels 307 00:29:37,840 --> 00:29:40,912 the snakes have formed a partnership with a fish. 308 00:29:42,120 --> 00:29:45,908 But here, it's trevally who know where food can be found. 309 00:29:47,960 --> 00:29:50,793 All the snakes need to do is follow them. 310 00:29:58,400 --> 00:30:01,358 When they arrive, the trevally show them where to look. 311 00:30:09,880 --> 00:30:13,839 Like moray eels, snakes can go Where others can't. 312 00:30:16,720 --> 00:30:18,950 But these snakes have a problem. 313 00:30:20,640 --> 00:30:22,676 They aren't the only ones hunting. 314 00:30:25,680 --> 00:30:28,478 Soon, there are too many after the same meal. 315 00:30:32,040 --> 00:30:34,634 The snakes and trevally grab what they can. 316 00:30:36,880 --> 00:30:38,791 But there is a limited supply. 317 00:30:40,440 --> 00:30:43,000 And more hungry snakes keep coming. 318 00:30:50,520 --> 00:30:53,910 This partnership works best with fewer numbers. 319 00:30:55,080 --> 00:30:58,038 Today, there are not enough fish to go round. 320 00:31:00,200 --> 00:31:02,634 But the snake couple won't go unrewarded. 321 00:31:03,360 --> 00:31:07,194 It's now a relationship of a more amorous kind. 322 00:31:09,400 --> 00:31:10,913 They head to the surface... 323 00:31:16,120 --> 00:31:19,476 joining together in a serpentine embrace... 324 00:31:23,000 --> 00:31:26,072 one that forms a fitting symbol. 325 00:31:42,560 --> 00:31:45,518 Together, they descend to the reef below. 326 00:32:09,000 --> 00:32:11,355 They'll stay entwined for up to an hour 327 00:32:11,680 --> 00:32:13,636 before going their separate ways. 328 00:32:22,000 --> 00:32:24,594 Of all the relationships found in the ocean 329 00:32:25,080 --> 00:32:27,833 few can beat the spinner dolphins. 330 00:32:29,080 --> 00:32:31,548 As well as gathering in huge numbers 331 00:32:32,000 --> 00:32:34,878 they are the acrobats of the dolphin world. 332 00:32:41,120 --> 00:32:43,509 They can leap over three metres high 333 00:32:43,600 --> 00:32:46,114 and spin seven times in ajump. 334 00:32:54,040 --> 00:32:56,679 Today, they're on a hunting expedition. 335 00:32:59,600 --> 00:33:02,751 Spy Dolphin is here to find out how they work as a team. 336 00:33:02,880 --> 00:33:04,518 DOLPHINS SQUEAK 337 00:33:10,040 --> 00:33:12,110 Their bubbles provide a clue. 338 00:33:14,840 --> 00:33:16,114 On closer inspection 339 00:33:16,200 --> 00:33:18,953 they plainly come from the dolphin's blowholes. 340 00:33:19,480 --> 00:33:21,994 DOLPHINS SOUEAK AND WHISTLE 341 00:33:23,320 --> 00:33:26,039 A sign they are Whistling to each other. 342 00:33:31,160 --> 00:33:34,038 They use these calls to bring the pod together. 343 00:33:37,760 --> 00:33:40,911 They also have a unique whistle to announce who they are. 344 00:33:41,920 --> 00:33:43,751 The dolphin equivalent of a name. 345 00:33:56,000 --> 00:33:59,709 As well as Whistles, they use clicks to communicate too. 346 00:34:00,000 --> 00:34:02,036 DOLPHINS SQUEAK AND CLICK 347 00:34:02,120 --> 00:34:03,917 Some clicks are ultrasonic 348 00:34:04,200 --> 00:34:05,872 far above our hearing range. 349 00:34:07,040 --> 00:34:08,951 All this works at close range 350 00:34:09,040 --> 00:34:11,190 but to contact dolphins far away 351 00:34:11,280 --> 00:34:13,669 they use their corkscrew leaping. 352 00:34:16,960 --> 00:34:19,315 For an aerial view of what's going on 353 00:34:19,800 --> 00:34:22,155 Spy Frigate films from above. 354 00:34:27,280 --> 00:34:30,238 The leaps can be seen by distant dolphins... 355 00:34:35,000 --> 00:34:37,992 while the splashing can be heard from far and wide. 356 00:34:43,000 --> 00:34:45,833 All these cues bring the dolphins together. 357 00:34:51,880 --> 00:34:55,111 United, they can hunt as a super team. 358 00:34:59,280 --> 00:35:02,795 Our spy is in the midst of an extraordinary gathering... 359 00:35:05,960 --> 00:35:09,748 one of the greatest mega—pods ever filmed. 360 00:35:15,160 --> 00:35:18,038 DOLPHINS SQUEAK AND CLICK 361 00:35:23,600 --> 00:35:27,912 Spy Dolphin is here to witness this astonishing moment... 362 00:35:29,200 --> 00:35:31,430 and there's yet more to discover. 363 00:35:33,480 --> 00:35:36,199 Yellowfin tuna also heard the dolphins 364 00:35:36,280 --> 00:35:38,236 and join their quest for a meal. 365 00:35:54,400 --> 00:35:57,198 As both dolphins and tuna travel together 366 00:35:57,680 --> 00:36:00,194 the ocean becomes a superhighway. 367 00:36:07,000 --> 00:36:09,958 Above, frigate birds join the travellers 368 00:36:11,240 --> 00:36:13,151 including our spy version. 369 00:36:17,720 --> 00:36:19,199 As they hear their goal 370 00:36:19,400 --> 00:36:21,868 the dolphins leap into action. 371 00:36:29,720 --> 00:36:32,996 A synchronised wave, thousands strong. 372 00:36:45,760 --> 00:36:49,548 Spy Frigate records the moment they close in on their target. 373 00:37:01,160 --> 00:37:04,470 They've found a fish shoal of an unexpected kind... 374 00:37:06,280 --> 00:37:08,748 a squadron of flying fish 375 00:37:10,560 --> 00:37:13,199 chased into the air by the hunting dolphins. 376 00:37:17,360 --> 00:37:20,033 The tuna even try to grab them as they fly. 377 00:37:25,840 --> 00:37:28,308 With dolphins and tuna working together 378 00:37:28,720 --> 00:37:29,914 few escape. 379 00:37:53,920 --> 00:37:56,070 The frigates, too, take what they can. 380 00:38:12,080 --> 00:38:15,550 An event made possible by extraordinary teamwork. 381 00:38:21,000 --> 00:38:24,117 As the day ends, they have reason to celebrate 382 00:38:24,480 --> 00:38:27,631 and they do it in true dolphin style. 383 00:38:40,240 --> 00:38:44,153 Off Mexico, shoals of mackerel are gathering too. 384 00:38:46,400 --> 00:38:49,995 Upwellings of nutrients have caused plankton to bloom. 385 00:38:53,520 --> 00:38:56,273 It's not only mackerel that relish the feast. 386 00:39:01,600 --> 00:39:02,999 A tuna crab 387 00:39:03,440 --> 00:39:05,351 a type of squat lobster. 388 00:39:10,200 --> 00:39:12,111 It won't be alone for long. 389 00:39:14,040 --> 00:39:16,315 More are rising from the depths. 390 00:39:28,120 --> 00:39:31,351 As always, there's a spy for every occasion... 391 00:39:37,200 --> 00:39:39,953 with a subject worthy of special attention. 392 00:39:45,320 --> 00:39:49,359 Tuna crabs only come together when conditions are perfect. 393 00:40:03,440 --> 00:40:05,112 They may all look the same 394 00:40:05,480 --> 00:40:07,391 but they are not short of character. 395 00:40:10,760 --> 00:40:13,877 A blade of seagrass becomes something to fight over. 396 00:40:26,040 --> 00:40:28,031 It's now a tug of war... 397 00:40:37,000 --> 00:40:39,673 with both a winner and a loser. 398 00:40:43,120 --> 00:40:46,237 Spy Tuna Crab arrived at a special moment... 399 00:40:48,960 --> 00:40:51,394 an event that has rarely been filmed. 400 00:40:59,000 --> 00:41:01,719 Hundreds soon become thousands. 401 00:41:03,240 --> 00:41:06,152 Then thousands become millions. 402 00:41:14,400 --> 00:41:17,039 They devour all the plankton they can. 403 00:41:19,200 --> 00:41:20,679 When they've had their fill 404 00:41:20,960 --> 00:41:23,155 they descend to the deep once more. 405 00:41:24,960 --> 00:41:27,428 Those that leave are soon replaced 406 00:41:27,760 --> 00:41:29,671 and so the cycle goes on. 407 00:41:49,880 --> 00:41:52,394 Such numbers have seldom been seen. 408 00:41:54,160 --> 00:41:55,513 A magical moment 409 00:41:56,160 --> 00:41:59,232 before they vanish into the depths once more. 410 00:42:06,400 --> 00:42:09,153 When autumn brings storms to the Caribbean 411 00:42:09,560 --> 00:42:11,312 another gathering begins. 412 00:42:16,760 --> 00:42:19,320 Spiny lobsters leave their hideaways 413 00:42:19,400 --> 00:42:20,958 and start to assemble. 414 00:42:25,160 --> 00:42:28,994 They're preparing to migrate to calmer and warmer waters. 415 00:42:32,040 --> 00:42:34,110 One has yet to join them... 416 00:42:35,600 --> 00:42:36,669 another spy. 417 00:42:42,160 --> 00:42:44,993 As the storm builds, conditions worsen. 418 00:42:59,480 --> 00:43:01,198 Alone, they're vulnerable... 419 00:43:02,000 --> 00:43:04,753 not just to currents, but predators too. 420 00:43:07,400 --> 00:43:09,994 So they'll make their journey together. 421 00:43:11,080 --> 00:43:13,594 Already, Spy Lobster has company. 422 00:43:19,280 --> 00:43:20,918 Others also couple up. 423 00:43:27,320 --> 00:43:29,834 Everyone joins the great migration... 424 00:43:32,680 --> 00:43:35,877 including our spy, and its newfound buddy. 425 00:43:40,720 --> 00:43:42,551 As the lobsters come together 426 00:43:42,880 --> 00:43:45,110 it becomes a game of follow-the—Ieader. 427 00:43:51,760 --> 00:43:53,557 Latecomers race to join... 428 00:43:55,640 --> 00:43:57,119 including our spy. 429 00:44:02,160 --> 00:44:04,310 A chain soon starts to form. 430 00:44:18,080 --> 00:44:20,150 It becomes a lobster conga 431 00:44:20,440 --> 00:44:22,829 their antennae keeping each in line. 432 00:44:31,400 --> 00:44:33,914 The members can number 50 or more. 433 00:44:34,520 --> 00:44:36,351 No one wants to be left behind. 434 00:44:43,720 --> 00:44:45,472 As they head for deeper water 435 00:44:45,680 --> 00:44:49,389 walking in line reduces drag and keeps them on course. 436 00:44:54,840 --> 00:44:57,070 Guided by the Earth's magnetic field 437 00:44:57,400 --> 00:44:59,470 they can march like this for days. 438 00:45:09,120 --> 00:45:11,759 Already, they are vanishing into the deep... 439 00:45:13,960 --> 00:45:17,316 leaving Spy Lobster far behind. 440 00:45:24,120 --> 00:45:27,351 Shipwrecks are testament to the power of the storms. 441 00:45:30,240 --> 00:45:33,949 They are now a refuge for those sheltering from the turmoil above. 442 00:45:38,960 --> 00:45:41,349 Another place, another spy! 443 00:45:45,600 --> 00:45:48,068 This time, Spy Nautilus. 444 00:45:58,000 --> 00:46:01,276 It finds that every nook and cranny is occupied. 445 00:46:02,680 --> 00:46:04,557 With little shelter elsewhere 446 00:46:04,760 --> 00:46:07,274 the wreck is a magnet for the vulnerable. 447 00:46:18,560 --> 00:46:20,949 Spy Lobster joins the search. 448 00:46:29,800 --> 00:46:31,870 Then, a promising sign. 449 00:46:35,080 --> 00:46:37,833 Two lobsters hiding beneath the broken bow. 450 00:46:39,720 --> 00:46:41,153 They're not the only ones. 451 00:46:43,000 --> 00:46:45,560 In every crevice, more can be found. 452 00:46:52,840 --> 00:46:54,637 With no claws to protect them 453 00:46:54,720 --> 00:46:56,790 wrecks like this keep them safe. 454 00:47:00,160 --> 00:47:02,833 For them, the journey has been worth it. 455 00:47:07,400 --> 00:47:09,277 Here, they'll spend the winter 456 00:47:09,560 --> 00:47:12,279 until the shallows warm once more. 457 00:47:22,520 --> 00:47:25,512 There is one place our spies have yet to visit. 458 00:47:27,280 --> 00:47:28,952 The islands of the Galapagos 459 00:47:29,040 --> 00:47:31,918 are home to a rich community of sea creatures. 460 00:47:34,040 --> 00:47:36,634 On the volcanic rocks that hug the coastline 461 00:47:37,000 --> 00:47:40,037 marine iguanas bask in the morning sun. 462 00:47:45,840 --> 00:47:47,478 It's a time to socialise 463 00:47:47,720 --> 00:47:49,790 as they warm up for the day ahead. 464 00:47:53,760 --> 00:47:56,911 Among the masses is a visitor from outside... 465 00:47:58,520 --> 00:48:02,035 a spy adapted to both land and sea. 466 00:48:06,080 --> 00:48:07,672 It needs both talents 467 00:48:07,840 --> 00:48:09,990 for iguanas feed on vegetation 468 00:48:10,080 --> 00:48:12,275 and the land has little to offer. 469 00:48:19,120 --> 00:48:20,917 Once they're up to temperature 470 00:48:21,440 --> 00:48:22,839 they take the plunge. 471 00:48:33,560 --> 00:48:34,549 Where they go... 472 00:48:35,120 --> 00:48:36,792 our spy must follow. 473 00:48:46,720 --> 00:48:48,711 Iguanas are coldblooded 474 00:48:48,960 --> 00:48:52,669 so their time in the cold sea is limited to just half an hour. 475 00:48:56,560 --> 00:48:58,710 That includes battling the surf. 476 00:49:07,240 --> 00:49:10,152 Spy Iguana swims just like the real thing 477 00:49:10,240 --> 00:49:12,595 propelled by its articulated tail. 478 00:49:21,120 --> 00:49:24,669 When an iguana dives, our spy dives too. 479 00:49:28,240 --> 00:49:31,357 The best feeding grounds lie deep beneath the waves. 480 00:49:33,000 --> 00:49:35,673 Our spy will join them there. 481 00:49:47,320 --> 00:49:49,072 Unlike the barren land 482 00:49:49,160 --> 00:49:51,754 the sea is rich in nutrients. 483 00:49:54,000 --> 00:49:57,037 It nourishes the algae the iguanas depend on. 484 00:50:04,040 --> 00:50:05,632 They eat little else. 485 00:50:18,200 --> 00:50:20,589 Each has chosen a spot to graze. 486 00:50:25,600 --> 00:50:28,114 Spy Iguana hardly causes a stir. 487 00:50:28,680 --> 00:50:30,318 There's no rivalry here. 488 00:50:34,800 --> 00:50:37,519 But the real iguanas are on borrowed time. 489 00:50:40,320 --> 00:50:43,232 He must eat what he can, while he can. 490 00:50:54,680 --> 00:50:58,036 Leave it too late, and he'll be too cold to make it back. 491 00:51:08,560 --> 00:51:10,630 But he knows when his time is up. 492 00:51:26,800 --> 00:51:29,792 He heads to the surface and returns to land. 493 00:51:40,000 --> 00:51:42,753 Our spy has many other inhabitants to meet. 494 00:51:48,240 --> 00:51:51,949 The most playful of all are Galapagos sealions. 495 00:51:56,440 --> 00:51:59,671 And who better to play with than our spy creature? 496 00:52:17,040 --> 00:52:20,510 But playing games is not in our spy's repertoire... 497 00:52:22,560 --> 00:52:25,358 no matter the encouragement it receives. 498 00:52:31,120 --> 00:52:33,873 The sealion seeks a more playful partner. 499 00:52:35,720 --> 00:52:39,315 But he leaves Spy Iguana in the best possible spot... 500 00:52:40,080 --> 00:52:43,390 just in time to meet a true wonder of the deep. 501 00:52:45,200 --> 00:52:46,349 Mola mola... 502 00:52:46,640 --> 00:52:48,073 a type of sunfish. 503 00:52:48,800 --> 00:52:52,679 Its only means of propulsion are its elongated fins. 504 00:52:55,080 --> 00:52:57,640 One of the largest bony fish in the ocean 505 00:52:57,720 --> 00:52:59,790 it reaches three metres in length. 506 00:53:04,360 --> 00:53:06,954 They visit for one reason only... 507 00:53:08,480 --> 00:53:11,950 to be cleaned by angelfish and hogfish. 508 00:53:14,960 --> 00:53:16,678 As our spies have found 509 00:53:16,760 --> 00:53:18,990 almost all undersea communities 510 00:53:19,080 --> 00:53:20,991 have their own grooming specialists. 511 00:53:27,920 --> 00:53:31,833 Job done, they return to the deep blue yonder. 512 00:53:41,160 --> 00:53:44,596 Our spy has one last inhabitant to find. 513 00:53:49,480 --> 00:53:53,075 The shallows are home to a colony of damselfish. 514 00:54:05,640 --> 00:54:07,835 They are suspicious of outsiders. 515 00:54:13,800 --> 00:54:15,279 They're keen gardeners 516 00:54:15,600 --> 00:54:17,636 so trespassers aren't welcome here. 517 00:54:25,080 --> 00:54:28,038 They spend their time tending their lawns of algae. 518 00:54:29,840 --> 00:54:32,638 Like an allotment, it's divided into plots. 519 00:54:34,480 --> 00:54:35,595 To attract a mate 520 00:54:35,800 --> 00:54:38,519 each male has his own patch to care for. 521 00:54:41,760 --> 00:54:43,671 They must beware of intruders. 522 00:54:46,360 --> 00:54:47,554 A sea urchin 523 00:54:47,640 --> 00:54:49,995 looking uncannily like a naval mine. 524 00:54:54,480 --> 00:54:56,994 It creates its own kind of devastation. 525 00:55:01,960 --> 00:55:05,157 It will graze their precious algae down to the rock. 526 00:55:09,200 --> 00:55:11,589 To remove it, they must work together... 527 00:55:16,240 --> 00:55:18,879 and use a bit of extra oomph. 528 00:55:29,640 --> 00:55:31,198 It's now out of his patch... 529 00:55:32,200 --> 00:55:33,474 and onto his neighbour's. 530 00:55:36,600 --> 00:55:39,956 Each damselfish passes it to the next fish along. 531 00:55:55,280 --> 00:55:58,158 They'll persevere until it's finally gone. 532 00:56:05,120 --> 00:56:06,189 Nearly there... 533 00:56:08,640 --> 00:56:09,629 Done it! 534 00:56:18,040 --> 00:56:20,554 But our spies' adventures aren't over. 535 00:56:22,960 --> 00:56:26,032 Spy Hammerhead has arrived in the Galapagos 536 00:56:26,120 --> 00:56:28,953 along with the hammerheads last seen off Colombia. 537 00:56:33,080 --> 00:56:35,640 The sharks are completing a round trip 538 00:56:35,760 --> 00:56:38,672 that began in the seas around these islands. 539 00:56:42,080 --> 00:56:45,117 Hammerheads, like other long—distance travellers 540 00:56:45,200 --> 00:56:47,555 connect distant communities. 541 00:56:49,240 --> 00:56:53,358 A network of partnerships that reach across the globe. 542 00:56:55,240 --> 00:56:56,912 As our spies have found 543 00:56:57,400 --> 00:56:59,709 ocean life is interconnected 544 00:56:59,800 --> 00:57:02,155 in ways we could hardly imagine. 545 00:57:08,120 --> 00:57:12,398 An undersea world built on extraordinary relationships. 546 00:57:16,880 --> 00:57:18,950 Next time, we discover some of the trouble 547 00:57:19,040 --> 00:57:20,632 sea creatures face. 548 00:57:22,120 --> 00:57:25,590 And what happens when things go horribly wrong. 549 00:57:29,960 --> 00:57:30,949 SEAL PUP CRIES 550 00:57:34,360 --> 00:57:36,669 WHALES SING41668

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