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1、Blains tries to entice the shark，close enough to slip a noose around its neck，but one false move and its game over. Finally it takes the bait. Slowly he prepares the noose.Blais cant keep hold of the thrashing shark, but this wooden float prevents it diving. Then, as if under a spell, the shark sudd
2、enly stops. But in fact the float exploits a quirk in shark biology, exhausting it so much, it enters a state known as tonic immobility.Blais approaches with caution. The shark is still very much alive and its bite could cause serious injury. In the past, Blains would have killed the shark for food.
3、 But today he lets it go free.Blais is committed to keeping his shark-calling culture alive.and this means keeping sharks alive. And its not just traditions that are threatened. In some seas around the world, a growing shortage of fish is forcing people deeper and deeper, just to land a decent catch
4、. So deep, they venture to the very limits of human survival. Welcome to the world of the Pa-align divers, perhaps the most dangerous fishing method of all.80 men, many of whom are still teenagers, are preparing to dive to over 40 metres,breathing air pumped through these makeshift tubes by this rus
5、ty compressor. Joseph is one of the youngest aboard, but hes aware of the risks. Hes already witnessed just how lethal his job can be. The seas around the Philippines were once rich with life, but theyve been so over-exploited that decent fish numbers are only found at perilous depths. The divers gu
6、ide the huge ball of nets 40 meters down to the sea floor, but all the while their air supply is at risk. Back on the boat, the ailing compressor and the ever-worsening tangle of tubes need constant attention. Like a failing heart pumping through clogged arteries, if this circulation system fails, a
7、t this depth, its almost certain death. Joseph and the team unravel the nets and lay them out by securing them to rocks. They must work fast. Joseph knows, the longer he spends at these depths, the more dangerous it becomes. With every breath, more nitrogen dissolves in his body, making him increasi
8、ngly vulnerable to decompression sickness” the bends”. The top of the net is suspended by plastic containers filled with air, creating a huge cavernous trap beneath. Now its time to set the scare line. The boats drag the 1,000-metre line to form a huge circle around the net, and the divers position
9、themselves along it. Joseph and the team begin closing the trap by swimming towards the net. The waving streamers and the curtain of rising bubbles panics the fish and they flee. As the line of divers tightens, more and more fish swim straight into the gaping net. This deep-sea round-up is so effect
10、ive, it can take 50% of the fish from a reef. The net is closed, and now Joseph must do something even more dangerous, get inside and herd the catch to the far end. On deck, the tangled web of tubes is getting worse. Once the catch is concentrated, the net is released from its anchor points. Now com
11、es the most lethal stage of all-guiding the net as it shoots to the surface. All too often, the divers ascend too quickly and get the bends. As the catch is hauled onto the boat, its size is revealed. Just under a tone of fish isnt bad but its nowhere near what these fishermen were landing a few yea
12、rs ago. And this isnt the only problem. Some of the crew do have the bends. One diver has returned to the bottom to relieve the symptoms, whilst, closer to the surface, another is massaged to release the painful bubbles in his spine. Every day, these Pa-align divers are taking greater risks for dwin
13、dling rewards. Joseph has his dreams, but the harsh reality is hell be diving twice again today just to make ends meet. Weve become so successful in the ocean its predicted that in 50 years almost all the fish could be gone.and this may not be the only change to come. All around the world, sea level
14、s are rising. Soon our planet could be even more dominated by the ocean, and our ability to survive here will be pushed to the very limit. Yet there are some people whove already adapted to life in a water world. In the coral seas between Borneo, Slaws and the Philippines, there are people who live
15、more intimately with the ocean than any other culture on earth. The Baja Lout build their lives in the middle of the sea, often many kilometers from land. The ocean has a profound influence on every aspect of their existence. They even measure the passage of time by the rhythm of the tides rather th
16、an minutes and hours. And there are some whose relationship with the sea runs even deeper. The Baja, who live on houseboats, have almost completely severed their ties with the land. Nowhere rarely sets foot ashore.Nohara and her family usually only visit land to trade for rice and fuel, or to mend their boats. But, like many Baja, Nowhere gets “land-sick” and she prefers to stay aboard. Her family has no nationality, no fix
