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  • 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  

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

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What’s Eating The Titanic?(What’s Eating The Titanic?)

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    林宜悉 に公開 2024 年 03 月 22 日
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