Placeholder Image

字幕列表 影片播放

  • The Titanic was once thought to be indestructibleand we all know how that turned out. And now it's  

  • dying a second death on the seafloor as it  erodes. It's disappearing so quickly that  

  • experts predict that by 2050 there will be no  sign of it. Meanwhile, this Greek merchant ship,  

  • which sank 2400 years ago, is super well  preservedwhat the wreck is going on here

  • Hi, I'm Cameron, and this is MinuteEarth. There are two main factors that determine how long  

  • a shipwreck might last on the seafloor. There's  a lot to consider, but in general, it comes  

  • down to what the ship is made of and how much  oxygen there is on the seafloor where it sank

  • For most of seafaring history, shipsboth  above and below the waterwere made mostly  

  • of wood. But during the industrial revolution  in the 1840s, people started making ships out  

  • of metalsmostly iron and steelthat gave  us bigger, stronger ships like the Titanic,  

  • the Lusitania, and modern luxury cruise ships. It stands to reason that these big,  

  • metal ships should outlast the wooden ones –  even underwaterand under some conditions,  

  • like, if there is oxygen around, they do. Warm, shallow, oxygen-filled water tends  

  • to be full of animals and microbes searching for  organic matter to gobble up. A wooden ship that  

  • sinks in these waters is a buffet for these  decomposers; they'll start breaking down the  

  • wreck almost immediately. Shipwormswhich are  so named for their incredible ability to burrow  

  • holes in wooden shipscan completely break down  a wooden shipwreck in as little as two years

  • That's not the case for a metal ship that sinks in  shallow waters, because there aren't any critters  

  • there capable of digesting iron or steelSure, the metal ship will eventually rust,  

  • but in these conditions, it will last  tens of times longer than the wooden ship

  • In deeper, colder waters with less oxygenthe rules are reversed. Wooden ships that  

  • sink here justlive on. That's becausein the depths, the water has so little  

  • oxygen that most organismsincluding those  wood-chomping decomposerscan't survive.  

  • The Black Sea – a particularly oxygen-poor  body of wateris home to at least 60 known  

  • immaculately preserved ancient shipwrecks from  as far back as the time of the ancient Greece;  

  • some are in such good shape that archaeologists  can literally read the engravings in their planks

  • Iron ships that sink in similarly  cold, deep water aren't so lucky.  

  • That's becausealthough wood-chompers  can't survive in these oxygen-poor waters,  

  • other, weirder, decomposers can. Instead  of using oxygen to make their bodies run,  

  • these microbes run on iron. They usually get their  iron from geologic vents on the seafloor, but when  

  • an iron shiplike the Titanicreaches their  depths, they'll happily feast on it. Scientists  

  • estimate that by 2050, these iron-chompers  will have consumed the entire Titanic

  • In other words, my heart may go  on, but this ship will be gone.

  • Ok normally I would do a painfully punny segue to  our sponsor here. Something like, “you know what  

  • ship doesn't get eaten by shipworms or bacteria  – a sponsorship!” But instead today I want to  

  • give you an update about something amazing that  thousands of you have made happen. Just by opening  

  • browser tabs, the MinuteEarth community alone has  raised more than $20,000 dollars for organizations  

  • like Partners in Health, which works to provide  community-based health care to those with limited  

  • access around the world. This is all through Tab  For A Cause, our favorite browser extension that,  

  • by adding a couple of ads in the corner of  your browser tabs, raises money for charity  

  • as you browse the web. But all that tabbing  has added up to big bucksif you're already  

  • part of our Tab for a Cause community, let us  know in the comments so we can thank you. And  

  • if you want to join the MinuteEarth viewers who  are literally helping to save lives around the  

  • world just by opening tabs, click on the link  in the description to get the extension today.

The Titanic was once thought to be indestructibleand we all know how that turned out. And now it's  

字幕與單字

單字即點即查 點擊單字可以查詢單字解釋

B2 中高級 美國腔

What’s Eating The Titanic?

  • 58 2
    VoiceTube staff 發佈於 2024 年 03 月 22 日
影片單字