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Tech & Science Plastic proliferates at the bottom of world's deepest ocean trench

07:06  14 may  2019
07:06  14 may  2019 Source:   nationalgeographic.com

Plastic proliferates at the bottom of world's deepest ocean trench

Plastic proliferates at the bottom of world's deepest ocean trench The remote Marianna Trench offers up yet another plastic bag during a recent deep submersible dive.

The Mariana Trench -- the deepest point in the ocean -- extends nearly 36,000 feet down in a remote part of the Pacific Ocean . From a report: A recent study revealed that a plastic bag, like the kind given away at grocery stores, is now the deepest known piece of plastic trash, found at a depth of 36

Victor Vescovo journeyed 10,927 meters (35,853 feet) to the bottom of the Challenger Deep , the southern end of the Pacific Ocean 's Mariana Trench , as part of a mission to chart the world ' s deepest underwater places. As well as four new species that could offer clues about the origins of life on Earth

Plastic proliferates at the bottom of world's deepest ocean trench © Photograph by Randy Olson, National Geographic

A plastic bag floats through Manila Bay in the Philippines.

This story is part of Planet or Plastic?—our multiyear effort to raise awareness about the global plastic waste crisis. Learn what you can do to reduce your own single-use plastics, and take your pledge.

Yet again, plastic is proving to be everywhere in the sea. During a dive to the bottom of the Mariana Trench that purportedly reached 35,849 feet, Dallas businessman Victor Vescovo claims to have found a plastic bag. And it's not even the first time: It's the third time plastic has been documented in the deepest explored part of the ocean.

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A plastic bag was found at a depth of almost 36,000 feet in the Mariana Trench . Scientists say it's the world ' s deepest known piece of plastic trash. Almost 36,000 feet underwater, near the very bottom of the world ’ s deepest ocean trench , scientists came across a troubling find: a plastic bag, similar

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Vescovo made his dive in a submersible on April 28 as part of his "Five Deeps" Expedition, which involve journeys to the deepest points in each of Earth's oceans. During the four hours Vescovo spent at the bottom of the Mariana Trench, he observed several marine creatures—one of which is a potentially new species—a plastic bag, and candy wrappers.

Few people have reached such extreme depths. Swiss engineer Jacques Piccard and U.S. Navy Lieutenant Don Walsh were the first in 1960. National Geographic explorer and movie director James Cameron then made a dive to the depths in 2012. Cameron logged 35,787 feet on his dive, just shy of the 62 feet that Vescovo claims to have reached.

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The Mariana Trench — the deepest point in the ocean — extends nearly 11km down in a remote part of the Pacific Ocean . But if you thought the trench could escape the global onslaught of plastics pollution, you would be wrong. A recent study revealed that a plastic bag, like the kind given away at

The deepest point on Earth is heavily polluted with plastic , scientists have discovered, showing how pervasively the world has been contaminated. The researchers plumbed the depths of the Mariana Trench in the western Pacific Ocean , near Challenger Deep , the lowest place on the face of the planet.

Unlike humans, plastic seems to descend with ease. Earlier this year, a study sampled amphipods in six deep-sea trenches, including the Mariana, and found all were ingesting microplastics.

Deep plastic

A study released in October 2018 documented what is still the deepest known piece of plastic—a flimsy shopping bag—found at a depth of 36,000 feet inside the Mariana Trench. Scientists found it by looking through the Deep-Sea Debris Database, a collection of photos and videos taken from 5,010 dives over the previous 30 years.

Of the classifiable debris logged in the database, plastic was the most prevalent, and plastic bags in particular made up the greatest source of plastic trash. Other debris came from material like rubber, metal, wood, and cloth.

A whopping 89 percent of the plastic in the study was single use, the type that's used once and then thrown away, like a plastic water bottle or disposable utensil.

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The Mariana Trench —the deepest point in the ocean —extends nearly 36,000 feet down in a remote part of the Pacific Ocean . While the Mariana Trench may seem like a dark, lifeless pit, it hosts more life than you might think. NOAA’ s Okeanos Explorer vessel searched the region’ s depths in 2016 and

Even one of the most remote places on Earth couldn't hide from the scourge of plastic trash.

The Mariana Trench is no dark, lifeless pit; it has plenty of residents. NOAA's Okeanos Explorer vessel searched the region's depths in 2016 and found diverse life-forms, including species like coral, jellyfish, and octopus. The 2018 study also found that 17 percent of the images of plastic logged in the database showed interactions of some kind with marine life, like animals becoming entangled in debris.

Where did the plastic come from?

Single-use plastics are virtually everywhere, and they may take hundreds of years or more to break down once in the wild. The Mariana Trench has higher levels of overall pollution in certain regions than some of the most polluted rivers in China, according to a study in February 2017. The study's authors theorized that the chemical pollutants in the trench may have come in part from the breakdown of plastic in the water column.

While plastic can enter the ocean directly, such as trash blown from a beach or discarded from ships, a study published in 2017 found that most of it flows into the sea from 10 rivers that run through heavily populated regions.

Discarded fishing gear is also a major source of plastic pollution, and a study published in March 2018 found that the material comprised the bulk of the Texas-size Great Pacific Garbage Patch floating between Hawaii and California.

While the ocean clearly contains much more plastic than a single plastic bag, the item has now gone from a wind-flung metaphor for listlessness to an example of how deep an impact humans can have on the planet.

This article was originally published in May 2018. It has been updated to reflect the discovery of another plastic bag in the depths of the Mariana Trench.

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