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It's complete mayhem on the wreck with fish darting every which way trying to avoid the jacks, yet still remain in the safety of schools.
沉船上一片混乱，鱼群向四处飞奔，试图避开杰克鱼的同时，仍然保持着鱼群的安全性。
Some of the schools are tightly packed around dark objects that are moving through the water.
一些鱼群紧紧围绕着在水中移动的黑色物体。
Sharks.
鲨鱼。
You might think that the fish would be crazy to hang around a shark but it's the perfect protection.
你可能会认为，鱼围着鲨鱼打转肯定是疯了，但这其实是最好的保护。
The scad are too small and maneuverable to be caught by a big shark.
竹荚鱼太小了，又极其灵敏，鲨鱼很难捉到它们。
As long as they steer clear of the shark's mouth, they are unlikely to become shark food.
只要它们避开鲨鱼的嘴，就不太可能成为鲨鱼的食物。
But the jacks would make a much better lunch for the shark, so they give the shark a wide berth.
但是杰克鱼会成为鲨鱼更好的午餐，所以它们对鲨鱼敬而远之。
The scad are using the sharks as bodyguards.
竹荚鱼则把鲨鱼当作保镖。
Unfortunately for the sharks, nobody asked them if they wanted to be bodyguards.
对鲨鱼来说不幸的是，没有人问它们是否想当保镖。
It doesn't seem like there is much they can do about it though.
不过，它们似乎对此无能为力。
But, the sharks have figured out how they can hide from the fish.
但是，鲨鱼已经找到了躲避鱼群的方法。
They take turns slipping inside the wreck.
它们轮流游进沉船里。
Down here, the scad seem to relax a bit, and they don't cling quite so close to the shark.
在下面，竹荚鱼似乎有点放松，没有紧紧地跟住鲨鱼。
The shark seems like she is taking a break from all the excitement.
鲨鱼似乎正在从骚动中解脱出来。
As she hovers inside the wreck, the fish mayhem is still taking place outside in the background.
它在沉船内盘旋时，沉船外仍是鱼群的一片混乱之景。
But that's not the most unusual thing going on here.
但这并不是最不寻常的事情。
This shark is hovering in place with perfect buoyancy control.
这条鲨鱼以完美的浮力控制在原地盘旋。
It's extremely rare to see a shark hovering.
很少有鲨鱼在海中盘旋。
Bony fish have a swim bladder they can use to adjust their buoyancy, so they can hover in place.
硬骨鱼有一个可以调节浮力的游泳囊，所以它们可以在原处盘游。
Sharks have no swim bladder and sink if they stop swimming.
鲨鱼没有鱼鳔，如果停止游泳就会下沉。
Most sharks either keep swimming all the time to stay up off the bottom, or settle down to rest now and then.
大多数鲨鱼要么一直在游泳以保持离开海底，要么偶尔静下来休息。
Hovering is just not an option.
盘游不是一个选择。
Sand Tigers however aren't about to let something like anatomy keep them from hovering.
然而，虎鲨不会让类似解剖学的东西阻止它们盘游。
They occasionally rise to the surface and take a big gulp of air, turning their stomach into an improvised swim bladder.
它们偶尔会浮到水面，吸一大口空气，把胃变成临时的鱼鳔。
Perfect buoyancy.
完美的浮力。
It can't be easy to get it right, but the sharks know just how much air they need to gulp down in order to hover inside a shipwreck 90 feet deep.
要弄好并不容易，但鲨鱼知道它们需要吞下多少空气，才能在90英尺深的沉船内盘游。
This shark has a rusty fishing hook stuck in her mouth.
这条鲨鱼嘴里勾着一个生锈的鱼钩。
Fortunately, the fisherman let her go, but didn't want to go near her teeth to remove the hook.
幸好渔夫放了她，但不想靠近它的牙齿去摘掉鱼钩。
So the line was cut.
所以，线被切断了。
But the hook will rust away in a few weeks, leaving a rusty stain in her mouth as evidence of the dangers of fishing hooks.
但鱼钩几周后就会生锈，在她嘴里留下生锈的污渍，作为鱼钩危险性的证据。
The teeth of the Sand Tiger shark are the ultimate fishing hooks.
虎鲨的牙齿是终极的鱼钩。
Long, thin and wickedly-sharp, they resemble a mouthful of needles, pointing backwards so nothing can wiggle out.
又长又细又锋利，像一口针头，指向后面，没有什么能躲得过。
These teeth are superbly designed to catch slippery fish.
这些牙齿设计得非常好，都能钓到滑溜溜的鱼。
But they are not cutting teeth.
但这些不是切牙。
Sand Tigers don't take bites out of large prey.
虎鲨不会咬食大型猎物。
They swallow smaller animals whole.
它们把小型动物全部吞下。
The Graveyard of the Atlantic may have begun with the death of hundreds of ships.
大西洋墓地可能是从数百艘船只的沉没开始的。
But new life is springing from these wrecks.
但新生命正从这些残骸中迸发出来。
As artificial reefs, they provide habitat for fish, invertebrates and even sharks, helping the ocean recover from decades of overfishing.
作为人工珊瑚礁，它们为鱼类、无脊椎动物，甚至鲨鱼提供栖息地，帮助海洋从数十年的过度捕捞中恢复过来。
Every time I visit the wrecks of North Carolina, I'm amazed by the experience, and astonished more than ever by the beauty and complexity of the Blue World.
每次我参观北卡罗莱纳州的沉船残骸时，我都会对这样的经历感到惊讶，对《蓝色世界》的美丽和复杂性感到前所未有的惊讶。
