1 00:00:03,138 --> 00:00:06,263 The Amazon, the world's mightiest river. 2 00:00:06,501 --> 00:00:10,984 What lives within its hundred meters depths is one of Earth's greastest mysteries. 3 00:00:12,610 --> 00:00:15,680 Now, an international team of divers and scientists 4 00:00:15,701 --> 00:00:19,087 are seeking life where no human has ever ventured before. 5 00:00:21,083 --> 00:00:23,667 To the very bottom of the Amazon. 6 00:00:24,945 --> 00:00:28,320 The expedition has already found extraordinary creatures, 7 00:00:28,447 --> 00:00:32,709 but they've only begun to explore what lies within this alien world. 8 00:00:53,671 --> 00:00:57,975 For 3 days, the team have been searching for the giant Jau catfish 9 00:00:58,049 --> 00:01:00,739 but this monster of the deep has eluded them. 10 00:01:00,852 --> 00:01:04,376 The diving is proving far more difficult then they imagined 11 00:01:04,449 --> 00:01:06,264 and they're behind schedule. 12 00:01:06,928 --> 00:01:10,135 A decision is made to split into 2 teams. 13 00:01:10,629 --> 00:01:14,880 In the first, veteran diver and wildlife cameraman Mike DeGruy 14 00:01:14,973 --> 00:01:17,990 joins brazilian professor Mario de Pinna 15 00:01:18,032 --> 00:01:21,271 on a mission to find creatures never filmed before. 16 00:01:21,672 --> 00:01:24,119 Fish that talk, 17 00:01:24,212 --> 00:01:27,113 animals that hunt using electricity, 18 00:01:28,643 --> 00:01:30,352 but their ultimate goal, 19 00:01:30,487 --> 00:01:34,686 to discover species completely new to science. 20 00:01:35,086 --> 00:01:38,998 In the second team, Kate Humble head deep into the jungle 21 00:01:39,282 --> 00:01:44,072 Her mission : to track down two of the Amazon's most elusive animals. 22 00:01:44,360 --> 00:01:46,934 The rare giant otter, 23 00:01:47,651 --> 00:01:52,208 and a strange pink river dolphin, the Boto. 24 00:01:57,391 --> 00:01:59,520 On their quest for new species, 25 00:01:59,594 --> 00:02:04,045 Mike and Mario have to cross one of the world's great natural spectacles 26 00:02:04,109 --> 00:02:06,756 The meeting of the waters. 27 00:02:07,320 --> 00:02:12,542 Here the black waters of the Rio Negro joins the milky waters of the river Amazon. 28 00:02:18,740 --> 00:02:23,550 Now, how long will the very, very definite line of demarkation 29 00:02:23,593 --> 00:02:27,389 It takes several kilometers , because the two water types are so different, 30 00:02:27,484 --> 00:02:31,956 but they're actualy not mix for quite some time. 31 00:02:35,541 --> 00:02:38,390 There they are, getting close. 32 00:02:38,906 --> 00:02:40,573 Astonishing. 33 00:02:45,115 --> 00:02:49,398 We're now leaving one river, ... entering another. 34 00:02:51,981 --> 00:02:55,726 Leaving the Rio Negro, they enter the silk-laden Amazon. 35 00:02:55,873 --> 00:02:58,279 Rich in minerals swept from the Andes, 36 00:02:58,384 --> 00:03:01,251 this river contains more types of fresh water fish, 37 00:03:01,483 --> 00:03:03,329 than anywhere else on Earth. 38 00:03:03,572 --> 00:03:06,695 An ideal hunting ground for new species. 39 00:03:13,954 --> 00:03:16,306 Many people make a living from the river, 40 00:03:16,333 --> 00:03:20,416 but all are weary of the creatures lurking in these murky waters. 41 00:03:20,637 --> 00:03:23,686 Mike is searching for one of the most feared of all, 42 00:03:23,770 --> 00:03:26,239 it's just 5 centimeters long, 43 00:03:26,379 --> 00:03:28,056 the candiru. 44 00:03:28,162 --> 00:03:31,558 The candiru has a nasty reputation, 45 00:03:31,622 --> 00:03:35,327 a reputation nastier than pretty much any fish 46 00:03:35,379 --> 00:03:37,552 I've ever met in my entire life. 47 00:03:39,633 --> 00:03:43,990 Candiru are vampires, parasites of other fish. 48 00:03:44,064 --> 00:03:47,746 They enter their host's body through their gills, and gourge on their blood. 49 00:03:48,461 --> 00:03:50,761 But in the turbulent waters of the Amazon, 50 00:03:50,834 --> 00:03:54,801 they sometimes enter humans,... by mistake. 51 00:03:58,939 --> 00:04:03,634 There was a medical record of the guy that had the unfortunate experience 52 00:04:03,834 --> 00:04:06,229 of the candiru swiming up his penis. 53 00:04:06,384 --> 00:04:10,137 So now everything I've been taught not to do : go into the water, 54 00:04:10,475 --> 00:04:14,032 it's a little fish, that has a nasty habit, 55 00:04:15,421 --> 00:04:18,695 of swiming up your urethra. 56 00:04:18,850 --> 00:04:21,072 That's right, that's what we're about to do. 57 00:04:26,521 --> 00:04:30,619 The candiru is more common on this beach, than anywhere else on the Amazon. 58 00:04:33,295 --> 00:04:35,455 But there's only one way to find them : 59 00:04:35,543 --> 00:04:37,832 you have to get in the water. 60 00:04:40,826 --> 00:04:42,507 I think we'll be safe. 61 00:04:44,078 --> 00:04:46,171 Or at least I hope we'll be. 62 00:05:00,053 --> 00:05:01,849 100 kilometers away, 63 00:05:01,890 --> 00:05:04,435 Kate's team is searching for aquatic giants, 64 00:05:04,501 --> 00:05:07,182 somewhere in the world's biggest reservoirs. 65 00:05:07,916 --> 00:05:10,157 When it was damed in 1987, 66 00:05:10,211 --> 00:05:13,039 it drown half a million trees, creating a lake 67 00:05:13,086 --> 00:05:15,158 larger than Luxembourg. 68 00:05:17,644 --> 00:05:19,994 It's extraordinay.... it has a 69 00:05:20,080 --> 00:05:22,740 kinda ghostly beauty about it. 70 00:05:25,779 --> 00:05:27,730 This area, now, 71 00:05:27,749 --> 00:05:29,903 partly because it's so protected, 72 00:05:30,051 --> 00:05:33,434 has become home not just for a huge diverse 73 00:05:33,473 --> 00:05:36,415 population of fish, including the black piranha, 74 00:05:36,753 --> 00:05:39,318 wich is the most fearsome of them all, 75 00:05:39,986 --> 00:05:42,045 but also to turles, 76 00:05:42,173 --> 00:05:45,023 and to giant otters. 77 00:05:45,120 --> 00:05:46,788 Very, very exciting. 78 00:05:47,024 --> 00:05:49,792 If Kate and her team can film the giant otters, 79 00:05:49,811 --> 00:05:53,599 it will also help local scientists identify family members, 80 00:05:53,638 --> 00:05:56,088 a useful tool for their protection. 81 00:05:58,579 --> 00:06:01,948 But finding the otters in this vast area won't be easy, 82 00:06:01,995 --> 00:06:05,175 only 3000 remain in the whole of South America. 83 00:06:07,906 --> 00:06:11,741 After 6 hours of looking , Kate hasn't seen a trace of an otter, 84 00:06:11,820 --> 00:06:16,580 but this remote reservoir has become home to a huge variety of wildlife. 85 00:06:24,636 --> 00:06:26,742 There's so much to look at. 86 00:06:30,742 --> 00:06:34,644 Mike's team are having no more luck in their search for the candiru. 87 00:06:34,710 --> 00:06:38,025 But they have met a trawl of bizzare little aliens, 88 00:06:38,139 --> 00:06:42,507 whose ancestors came from the ocean, 1000 miles away. 89 00:06:43,918 --> 00:06:45,606 Look at those teeth... 90 00:06:45,916 --> 00:06:47,753 The needle-fish. 91 00:06:48,130 --> 00:06:51,728 Have a marine version of this, and looks exacly like this actually. 92 00:06:52,706 --> 00:06:54,684 Snappy little fellow, too. 93 00:06:57,335 --> 00:06:59,928 This...is everybody's favorite... 94 00:07:00,251 --> 00:07:01,763 It's a puffle-fish. 95 00:07:01,965 --> 00:07:03,768 When a predator takes them, 96 00:07:03,923 --> 00:07:06,016 it puffs up, and they can't get them down, 97 00:07:06,183 --> 00:07:07,453 should have let them go. 98 00:07:07,985 --> 00:07:12,096 Or it can go into a crack or crevice, and puff up and it can't be extracted. 99 00:07:12,413 --> 00:07:14,978 I need to get them back in the water pretty quicly, tho. 100 00:07:15,977 --> 00:07:18,158 No sign of candiru, yet, 101 00:07:18,208 --> 00:07:21,435 but , instead, a fish that wards off predators 102 00:07:23,007 --> 00:07:24,506 by talking. 103 00:07:26,888 --> 00:07:29,123 Armored catfish. 104 00:07:33,885 --> 00:07:36,653 Mix these songs, trying to get rid of you. 105 00:07:37,057 --> 00:07:39,621 Go ahead, bring it up, here we go. 106 00:07:39,689 --> 00:07:41,944 Come on, say hi. 107 00:07:44,280 --> 00:07:46,177 He's saying : please let me go. 108 00:07:49,306 --> 00:07:50,609 See ya. 109 00:07:57,458 --> 00:08:01,495 Kate's found another distraction, on her search for giant otters. 110 00:08:01,669 --> 00:08:05,409 A skimmer, plucking fish from the surface of the water. 111 00:08:05,747 --> 00:08:07,361 I suppose this is the ... 112 00:08:08,331 --> 00:08:11,532 beauty of being in a ... 113 00:08:11,642 --> 00:08:13,478 closed reserve 114 00:08:13,708 --> 00:08:18,063 The animals had absolutely no human contact, so they're not scared of it. 115 00:08:25,991 --> 00:08:28,104 I want to go into the water. 116 00:08:28,347 --> 00:08:31,196 We are absolutely surronded by botos. 117 00:08:31,727 --> 00:08:35,231 Boto, a pink, fresh water dolphin. 118 00:08:35,643 --> 00:08:37,655 Well, the 6 hour journey 119 00:08:38,214 --> 00:08:41,671 is now extended to... 120 00:08:42,755 --> 00:08:44,713 I think about 8 hours. 121 00:08:45,544 --> 00:08:47,407 It's entirely my fault. 122 00:08:48,283 --> 00:08:50,484 There's so much to look at. 123 00:08:54,338 --> 00:08:57,186 We have to make camp before it gets dark. 124 00:08:58,489 --> 00:09:00,460 We're here for 2 days, I'm sorry. 125 00:09:09,326 --> 00:09:12,796 Mike and his team have been in the water 2 hours. 126 00:09:16,842 --> 00:09:21,413 If a candiru enters their body, they'll need emergency surgery to cut it out, 127 00:09:27,506 --> 00:09:29,538 but at last, he catches one. 128 00:09:30,301 --> 00:09:32,462 Fortunately, in the net. 129 00:09:34,451 --> 00:09:37,698 These fish have modified teeth outside of the mouth, 130 00:09:38,061 --> 00:09:40,897 so these are not real spines, they are actually teeth. 131 00:09:41,200 --> 00:09:43,293 That what all the fuss is about. 132 00:09:44,382 --> 00:09:47,731 Candiru, the famous and infamous. 133 00:09:47,919 --> 00:09:52,179 Now, when they're full of blood, this will be a little larger in diameter, 134 00:09:52,232 --> 00:09:54,885 and red. They are about twice the size. 135 00:09:54,904 --> 00:09:59,191 I can feel those spines and ... teeth. 136 00:10:00,027 --> 00:10:02,437 So now we can see how it actually moves, 137 00:10:02,471 --> 00:10:04,726 when it's trying to get in something. 138 00:10:08,647 --> 00:10:10,908 They move on to their ultimate goal: 139 00:10:11,029 --> 00:10:15,012 To discover species completely new to science. 140 00:10:24,641 --> 00:10:27,233 The team are going to try a new tactic. 141 00:10:27,314 --> 00:10:29,272 To dive in the dead of night. 142 00:10:29,315 --> 00:10:32,123 They use the daylight for preparing their gear. 143 00:10:35,206 --> 00:10:39,223 Underwater cameraman Mike Pitts makes his final equipment check. 144 00:10:40,599 --> 00:10:44,765 9 tenths of any job underwater is up here. 145 00:10:45,210 --> 00:10:48,714 Simply you make it up here, 146 00:10:49,300 --> 00:10:51,164 it's so much easyer when you're down there. 147 00:10:51,555 --> 00:10:54,148 The camera system is ready to go. 148 00:11:00,768 --> 00:11:03,171 It's time to test their theory. 149 00:11:03,872 --> 00:11:06,066 Absorbant time-remaining OK ? Yeah. 150 00:11:06,924 --> 00:11:09,429 Computer electronics turned on. Yeah. 151 00:11:10,967 --> 00:11:13,350 Oxygen tank on. Yeah. 152 00:11:15,401 --> 00:11:18,176 Diving at night is more dangerous. 153 00:11:18,243 --> 00:11:21,032 It's all too easy to get lost in the darkness. 154 00:11:21,162 --> 00:11:23,808 If anything goes wrong, they're totally on their own. 155 00:11:24,173 --> 00:11:26,894 The nearest hospital is 3 days away. 156 00:11:34,521 --> 00:11:38,451 They're all in, I'm getting happier by the minute, and they're all going for it. 157 00:11:51,315 --> 00:11:54,374 At first, this alien world seems empty. 158 00:12:01,192 --> 00:12:04,223 But an hour into their dive, and 30 meters deep, 159 00:12:04,311 --> 00:12:07,018 strange creatures start to appear. 160 00:12:13,713 --> 00:12:15,874 The blind tube-snout. 161 00:12:16,015 --> 00:12:19,020 One meter long, but only a centimeter thick, 162 00:12:19,280 --> 00:12:24,856 it uses its dark pink electric organ to communicate and find food in the gloom. 163 00:12:28,444 --> 00:12:32,023 But when the fish come out, so did the predators. 164 00:12:40,991 --> 00:12:46,291 Somewhere in the darkness, a Boto dolphin is searching for prey with sonar. 165 00:12:54,043 --> 00:12:58,162 The Panaque, the only fish on Earth that eats wood. 166 00:13:04,510 --> 00:13:07,467 Their huge gut holds unique bacteria 167 00:13:07,513 --> 00:13:10,322 to digest the dense hardwoods of the Amazon. 168 00:13:25,644 --> 00:13:27,251 Suddenly there's a problem. 169 00:13:29,072 --> 00:13:31,854 Mike Pitts's air supply has malfunctioned. 170 00:13:33,379 --> 00:13:37,896 He's 20 meters below the surface, and in danger of loosing consciousness. 171 00:13:55,308 --> 00:13:58,913 Despite the urgency, it's crucial they ascend slowly. 172 00:13:59,391 --> 00:14:04,576 Coming up too fast can cause serious medical injuries. 173 00:14:34,057 --> 00:14:36,251 The guys were just over an hour into their dive, 174 00:14:36,312 --> 00:14:38,188 and they had a rebreather problem, 175 00:14:38,235 --> 00:14:41,023 not entirely sure what it was, 176 00:14:41,039 --> 00:14:44,791 sounds like some electronics had gone down, and they had to climb manually. 177 00:14:45,985 --> 00:14:48,314 You're taking first aid precautions. 178 00:14:49,609 --> 00:14:52,040 The last little bit of their ascent 179 00:14:52,295 --> 00:14:57,021 was quit rapid, and it's the last little bit.... that is important. 180 00:14:57,398 --> 00:15:00,679 We've put them on pure oxygen, as a precaution. 181 00:15:01,799 --> 00:15:05,323 I half considered dropping the camera...half considered it. 182 00:15:06,024 --> 00:15:09,136 And then I thought I can't control it properly. 183 00:15:11,957 --> 00:15:14,381 You feeling alright , fellows ? Just give me a thumbs up. 184 00:15:19,039 --> 00:15:22,860 The incident drives home just how alone they really are. 185 00:15:32,989 --> 00:15:36,527 Next morning, Kate is been joined by Fernando Costus , 186 00:15:36,544 --> 00:15:39,764 who's spent 4 years studying giant otters. 187 00:15:40,134 --> 00:15:44,584 He knows, that to have any chance of filming them, they must start the search at dawn. 188 00:15:47,134 --> 00:15:51,305 It's just gone 5 in the morning... 189 00:15:51,324 --> 00:15:54,558 and Fernando and I are on a quest 190 00:15:54,692 --> 00:15:59,323 to see if the giant otters are having more of a lie in than us. 191 00:16:01,943 --> 00:16:04,961 Fernando often goes days without seeing an otter 192 00:16:05,020 --> 00:16:08,530 and he's developed some unconventional techniques to find them. 193 00:16:23,309 --> 00:16:26,752 This is the den, underneath the vegetation. 194 00:16:27,109 --> 00:16:29,101 The entrance of the den, here. 195 00:16:29,509 --> 00:16:34,141 I'm also collecting some thesis to know what they're eating here, in the lake. 196 00:16:34,545 --> 00:16:37,630 Because we know giant otters, they eat mainly fish 197 00:16:37,804 --> 00:16:38,979 like piranhas. 198 00:16:39,026 --> 00:16:42,800 And what type of piranhas are in this lake ? Mainly black. 199 00:16:43,022 --> 00:16:46,127 Big ones...they can reach up to 2 kilos. 200 00:16:46,160 --> 00:16:50,243 They are big animans... And very agresive. 201 00:16:51,545 --> 00:16:54,131 This lake is teeming with black piranhas. 202 00:16:54,212 --> 00:16:56,440 It should be perfect otter territory, 203 00:16:56,608 --> 00:17:01,239 but as each hour passes, their chance of finding the otters seems more remote. 204 00:17:09,273 --> 00:17:12,501 Mike and Mario are still on the search for new species. 205 00:17:12,533 --> 00:17:16,307 It's going to take them to places far too shallow for the main boat. 206 00:17:23,283 --> 00:17:25,896 The Amazon's small streams are crystal clear, 207 00:17:25,970 --> 00:17:28,043 because it hasn't rained for weeks. 208 00:17:28,089 --> 00:17:31,107 This might be their best chance to find new life. 209 00:17:38,281 --> 00:17:40,773 But nothing's that simple in the Amazon. 210 00:17:56,443 --> 00:18:01,230 This rain is gonna wash down the exposed clay and mud, 211 00:18:01,300 --> 00:18:03,210 and it's gonna turn it into muck. 212 00:18:03,285 --> 00:18:06,585 It seems their best hope for finding animals new to science 213 00:18:06,612 --> 00:18:08,671 is being washed away in the mud. 214 00:18:08,751 --> 00:18:11,774 Finally we find a place where we think we can work, 215 00:18:11,815 --> 00:18:13,172 and this is what happends. 216 00:18:14,366 --> 00:18:15,993 That's typical, isn't it ? 217 00:18:27,180 --> 00:18:31,319 Back at the reservoir, the sun is shining on Kate and Fernando. 218 00:18:31,540 --> 00:18:35,092 But that means the otters may have left the dens for today. 219 00:18:39,018 --> 00:18:42,461 The opportunity to film them may already have been lost. 220 00:18:51,301 --> 00:18:53,185 They are there, they are leaving the den. 221 00:18:59,448 --> 00:19:00,745 Hello guys. 222 00:19:02,980 --> 00:19:05,026 What was that call ? 223 00:19:05,167 --> 00:19:08,503 A warning call, or is it a sort of... 224 00:19:13,437 --> 00:19:16,989 They are relaxed, they are not alert, they are not in danger... 225 00:19:18,052 --> 00:19:20,834 226 00:19:28,278 --> 00:19:32,666 Hunted for years for their fur, they were nearly driven to extinction. 227 00:19:33,388 --> 00:19:35,265 Here at least, they are safe. 228 00:19:35,661 --> 00:19:37,768 Creating a unique opportunity 229 00:19:37,795 --> 00:19:41,069 for the biologists to find more about their way of life. 230 00:19:42,405 --> 00:19:43,802 This one's got a fish there. 231 00:19:43,862 --> 00:19:45,388 Big fish. 232 00:19:46,211 --> 00:19:48,055 Just getting a better grip. 233 00:20:29,840 --> 00:20:33,709 Because the feet are totally webbed, they could almost be flippers. 234 00:20:36,510 --> 00:20:39,474 So, do you think this might be the alpha male and female ? 235 00:20:41,552 --> 00:20:45,873 The team's footage will help Fernando to identify family members. 236 00:20:45,933 --> 00:20:49,741 An important step in the protection of these incredible animals. 237 00:20:50,212 --> 00:20:52,163 I can see why... 238 00:20:52,271 --> 00:20:53,675 you came back. 239 00:20:54,390 --> 00:20:58,062 Year after year, after year... 240 00:21:06,138 --> 00:21:08,494 I just don't see this working 241 00:21:09,149 --> 00:21:11,262 Mike's having no luck at all. 242 00:21:11,490 --> 00:21:15,082 The rain has spoiled his chances of finding new species. 243 00:21:15,871 --> 00:21:18,605 This is going to be muddy for the rest of the day. 244 00:21:18,929 --> 00:21:20,158 Hey, Mario ! 245 00:21:21,284 --> 00:21:23,856 This just isn't gonna work, I can't see anything. 246 00:21:24,038 --> 00:21:26,934 I think we catch them, put them in the aquarium 247 00:21:29,073 --> 00:21:32,476 Filming animals in ankle-deep mud is impossible. 248 00:21:32,995 --> 00:21:35,439 Mike and biologist Mario decide to catch 249 00:21:35,648 --> 00:21:38,234 and film fish in the tank , instead. 250 00:21:44,348 --> 00:21:47,163 Here, we have several representatives of the... 251 00:21:51,886 --> 00:21:55,505 Is this common here ? on scoop, and you get a dozen fish ? 252 00:21:55,530 --> 00:21:56,881 Yeah, yeah... 253 00:21:57,041 --> 00:22:00,998 A lot of life... It's amazin how little water can hold so much life... 254 00:22:01,072 --> 00:22:02,341 It's fantastic. 255 00:22:03,756 --> 00:22:07,395 In the net, Mario spots something that looks different. 256 00:22:13,603 --> 00:22:16,243 These people live beside a small stream 257 00:22:16,276 --> 00:22:20,589 that has as many types of fish, as all the rivers in Britain combined. 258 00:22:23,757 --> 00:22:26,579 The team set up a portable jungle studio, 259 00:22:26,625 --> 00:22:29,204 to film the unusual fish. 260 00:22:51,128 --> 00:22:54,064 At last, they found what they've been looking for. 261 00:22:54,212 --> 00:22:55,900 A new species. 262 00:22:57,680 --> 00:23:00,732 This is perfect...this is ichtiological history. 263 00:23:01,157 --> 00:23:02,434 Just fantastic. 264 00:23:03,776 --> 00:23:05,045 Hold that down 265 00:23:08,108 --> 00:23:11,315 That's no doubt that that's blood. 266 00:23:11,720 --> 00:23:14,522 This is a new species that does really weird, 267 00:23:14,569 --> 00:23:16,804 like sucks blood, in addition to all that, 268 00:23:16,843 --> 00:23:19,483 it has become really small, so it can actually 269 00:23:19,515 --> 00:23:21,703 use the fish in these little creeks. 270 00:23:22,174 --> 00:23:25,536 It's a new species of blood-sucking catfish. 271 00:23:25,685 --> 00:23:29,704 It maybe small, but it's an important scientific discovery. 272 00:23:33,448 --> 00:23:38,052 Animal vampires often posses chemicals that thin the blood of their victims. 273 00:23:38,485 --> 00:23:42,968 It's possible thier discovery could lead to better treatments for heart disease. 274 00:23:43,022 --> 00:23:44,130 Well done, Mario. 275 00:23:51,132 --> 00:23:53,319 After Kate's success with the otters, 276 00:23:53,360 --> 00:23:56,168 she's determined to find the Boto dolphins. 277 00:23:56,788 --> 00:23:58,233 She's had a tip-off 278 00:23:58,583 --> 00:24:01,581 It seems the best place to find wild Boto 279 00:24:01,891 --> 00:24:03,755 is the local beach resort. 280 00:24:21,008 --> 00:24:24,364 This small town has become quite famous for this little restaurant, 281 00:24:25,436 --> 00:24:28,954 because the daugthers of the owners of this restaurant 282 00:24:28,992 --> 00:24:31,308 have been feeding the dolphins 283 00:24:31,414 --> 00:24:35,909 and, maybe, but not only can i feed them, but I can get into water with them. 284 00:24:45,687 --> 00:24:48,976 Kate lures the Boto, so that the sound recorders 285 00:24:49,023 --> 00:24:52,818 can try and make a rare , underwater recording of their calls. 286 00:25:02,757 --> 00:25:05,241 Even they're coming right up here, 287 00:25:05,308 --> 00:25:06,361 you still, 288 00:25:07,624 --> 00:25:09,925 can't really get an idea of what look like, 289 00:25:09,959 --> 00:25:12,153 because it's so dark down there. 290 00:25:12,246 --> 00:25:13,839 I want to see your face. 291 00:25:17,134 --> 00:25:18,228 It's one right here. 292 00:25:20,060 --> 00:25:22,491 Unbelivable. 293 00:25:25,224 --> 00:25:28,364 They got long rows of teeth on either side. 294 00:25:29,429 --> 00:25:31,825 Totally twisted beak 295 00:25:33,588 --> 00:25:35,093 Oh, it's a big one here. 296 00:25:35,898 --> 00:25:40,872 Got these really big kind of... bulging... foreheads, 297 00:25:41,805 --> 00:25:43,567 wich is the sonar 298 00:25:43,931 --> 00:25:47,246 wich they definately need in water this dark. 299 00:25:49,910 --> 00:25:52,186 Constant clicking. 300 00:25:53,737 --> 00:25:58,085 Have you noticed that when they come out and take fish, does the sound change ?... 301 00:26:07,308 --> 00:26:11,804 Now, that Kate attracted the Botos, the camera team can get in the water. 302 00:26:12,242 --> 00:26:15,463 But they've no idea how these dolphins will react. 303 00:26:31,479 --> 00:26:36,158 The dolphins show no fear of the cameraman, as they swim through their strange world, 304 00:26:36,204 --> 00:26:39,701 stained deep red from the rainforest's leaves. 305 00:26:47,021 --> 00:26:48,519 It likes you a bit better. 306 00:26:49,675 --> 00:26:51,471 This is fantastic. 307 00:26:58,308 --> 00:27:00,590 Kate's team are achieving their goal, 308 00:27:00,629 --> 00:27:05,429 by capturing remarkable underwater images of these amazing animals. 309 00:27:06,834 --> 00:27:11,465 They're also discovering that wild Botos can be surprisingly gentil. 310 00:27:13,714 --> 00:27:17,711 There this... there are various stories... 311 00:27:17,798 --> 00:27:20,849 legends about Boto that they take human form, 312 00:27:21,241 --> 00:27:23,860 and they whisk away the prettiest girls in the village 313 00:27:24,534 --> 00:27:26,053 and it's very strange, 314 00:27:26,329 --> 00:27:30,406 looking at them under water, they do look curiously human, as their skin is 315 00:27:30,801 --> 00:27:32,914 same color as ours, and... 316 00:27:33,811 --> 00:27:38,908 yeah, they have this sort of... quite human looking form underwater. 317 00:27:57,548 --> 00:27:59,587 Well, I think 318 00:27:59,938 --> 00:28:02,565 they are officialy full. 319 00:28:03,158 --> 00:28:05,879 This one, just down here, tickling my feet.... 320 00:28:07,639 --> 00:28:10,387 That's it...no more fish 321 00:28:10,688 --> 00:28:14,637 What an amazing , ... amazing experience. 322 00:28:21,181 --> 00:28:24,260 Tomorrow the expedition heads further upriver, 323 00:28:24,286 --> 00:28:28,114 and has a close encounter with a giant anaconda.