Les Scientifiques ont Découvert des Trous Mystérieux Dans le lac Michigan

Sympa

Avez-vous entendu parler des trous étranges que les scientifiques ont trouvés au fond du lac Michigan ? Des plongeurs explorant le lac sont tombés par hasard sur des creux parfaitement ronds qui ressemblent à quelque chose sorti d'un film de science-fiction. Au début, les gens ont plaisanté en disant que cela pourrait être des extraterrestres ou des cercles de culture sous-marins, mais la vérité reste encore assez mystérieuse. Les scientifiques pensent que les trous pourraient être formés par du gaz méthane s'échappant sous le lit du lac, ou peut-être par de forts courants sous-marins érodant le sable. Ce qui est encore plus fascinant, c’est que ces trous abritent des écosystèmes uniques avec d'étranges micro-organismes. C'est comme un monde sous-marin entier que nous commençons tout juste à explorer !  Animation créée par Sympa. ---------------------------------------------------------------------------------------- Musique par Epidemic Sound https://www.epidemicsound.com   Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna​ ---------------------------------------------------------------------------------------- Nos réseaux sociaux : Facebook: https://www.facebook.com/sympasympacom/ Instagram: https://www.instagram.com/sympa.officiel/  Stock de fichiers (photos, vidéos et autres): https://www.depositphotos.com https://www.shutterstock.com https://www.eastnews.ru ----------------------------------------------------------------------------------------  Si tu en veux encore plus, fais un tour ici:  http://sympa-sympa.com

Transcript

00:00The Michigan Lake is recognized as one of the most vast and enigmatic freshwater lakes in the United States.

00:07Recently, in these depths, scientists have made an unexplained discovery.

00:12Huge circular craters scattered at the bottom of the lake.

00:17It all started in 2022, when a team of researchers began to map the bottom of Lake Michigan and search for wrecks.

00:25They expected to find there a typical landscape made of rocks or sand banks.

00:30However, what they saw on their sonar left them speechless.

00:34Circular structures so perfect that they almost seemed to defy the laws of nature.

00:40These formations are located about 150 meters below the surface, in areas where the water becomes opaque and unfathomable.

00:47They are impressive in their size, measuring between 90 and 180 meters in diameter, with a depth of up to 12 meters.

00:56And there are dozens of them, arranged with surprising regularity, evoking strange footprints.

01:02But the team remains perplexed about their origin.

01:05Then, in August 2024, the mystery thickened.

01:09Thanks to a remote-controlled vehicle, the researchers were able to examine these structures more closely.

01:14They have thus recorded about forty of these formations, totally unprecedented in the history of large lakes.

01:21What could be the origin of these craters?

01:24Is it possible that they are traces of an old geological event forgotten?

01:29If this is the case, it is intriguing to note that they have remained intact, preserving disturbances over time.

01:36Different hypotheses have emerged.

01:39Among them, the possibility that they are dolinae.

01:42These sudden collapses of the earth's surface, which allow buoyant cavities to appear.

01:49The rock located under the surface, often made up of limestone, slowly dissolves under the effect of water, which generates underground cavities.

01:57When the surface located above these cavities becomes unable to support its own weight, it ends up collapsing, thus forming a hole.

02:06Imagine this as when you push a straw through the operculum of a drink.

02:12Dolinae can be modest hollows or gigantic cavities that can reach up to 600 meters in diameter.

02:18They can form little by little or appear abruptly.

02:22Sometimes they are able to swallow cars, or even entire buildings.

02:27Lake Michigan lies on a rocky substrate made up of limestone, a rock that easily erodes under the action of water.

02:35This phenomenon has already been observed in Lake Huron, where similar dolinae have been identified.

02:42However, this theory presents some inconsistencies, not to say flaws.

02:46It is thus surprising that all these formations are so imposing.

02:50And it is unusual, if even rare, that dolinae form in the bed of a lake.

02:55In addition, these structures seem to be organized in a linear pattern.

02:59These dolinae extend mainly to the south, forming a diffuse line, which is at least curious.

03:05If these formations are really dolinae, they seem to defy the rules of geology.

03:10It could also be a new and unusual process, still unknown, which would occur under the surface of the lake.

03:18But another theory could explain this mystery, that of glaciers.

03:23Glaciers, real ice rivers, have covered a large part of the Earth during the last ice age.

03:30Their power is prodigious.

03:32Although they advance slowly, sometimes only a few centimeters per day,

03:37their colossal weight allows them to completely remodel landscapes over the millennia.

03:43As they advance, the glaciers crush and dig into the terrain below them, like huge natural bulldozers.

03:49Their mass, combined with their inexorable movement, erodes everything in its path,

03:55whether it is rock, soil, or even rocky substrate.

03:59This process can lead to the formation of deep burrows in the earth's crust, called glacial valleys.

04:06During the Ice Age, many glaciers covered the north of the United States, including the Great Lakes region.

04:12If they crossed what is now Lake Michigan, it is possible that they dug these deep holes.

04:19Glaciers generally move in a relatively straight line.

04:23As they advance, they erode the terrain, but the intensity of erosion varies depending on the nature of the rocky substrate.

04:30For example, areas where the rock is softer or fractured are more easily carved and compressed by the glacier,

04:37which could explain why some holes are larger and deeper than others, the harder rocky substrates being less affected.

04:45However, this erosion usually only generates large depressions in the form of crescents,

04:50and not vast circular craters like those observed in Lake Michigan.

04:55Once the glaciers have melted, the Great Lakes have formed.

04:58If the craters are indeed the result of glacial activity,

05:02it is possible that they were submerged, thus becoming an integral part of Lake Michigan.

05:07But this theory remains speculative and requires more evidence.

05:11However, there is another dimension to this mystery.

05:14These craters are not just intriguing formations.

05:17They could actually contain precious clues about the first forms of terrestrial life.

05:23Some parts of Lake Michigan, including the dark areas, have a low oxygen content.

05:29We could consider them as an edulcorated version of deep ocean environments,

05:34often characterized by a great lack of oxygen.

05:37For example, the hydrothermal vents of the Great Basins,

05:40the underwater openings in the crust of the Earth containing hot and mineralized water,

05:45and where oxygen is often scarce.

05:47However, some organisms thrive in environments such as these.

05:51For example, mycidae, tiny creatures similar to shrimp living in cold and deep waters.

05:58And, like opossums, they have a pocket to carry their young.

06:03Or the cotweidea of the depths,

06:06small sedentary fish that also thrive in cold lakes.

06:10These creatures are perfectly adapted to life in the dark waters

06:13and are generally close to the bottom of the lake.

06:16There are also strange organisms, such as invasive quagga molds,

06:20which look like shells.

06:22These are small soft-water molds that have spread all the way to the Great Lakes.

06:27They cling to the surface and can cause problems to ecosystems

06:31by competing with indigenous species for food and space.

06:35All these organisms could be found in Lake Michigan, and many others.

06:39There could be microbes, or even bacteria,

06:42specially adapted to these extreme conditions,

06:45as was the case in Lake Huron.

06:47There are only a small number of creatures

06:49capable of surviving deeply inside these craters.

06:52And their study could give us valuable clues

06:55about how life flourished in the ancient oceans,

06:58poor in oxygen.

07:00It is precisely in similar environments

07:03that some of the first forms of life flourished.

07:06Primitive land had an atmosphere containing little oxygen,

07:10but was much warmer.

07:12And ancient microorganisms had adapted to these conditions.

07:16The Great Lakes, especially Lake Michigan,

07:18have always had a somewhat ghostly reputation.

07:22Although this mission, which had been organized to study the wrecks,

07:26there were about 6,000 in the Great Lakes.

07:29Many wrecks still rest on the bottom of the lake,

07:32preserved by the cold waters.

07:35And shipwrecks are not the only strange phenomena related to the Great Lakes.

07:39Over the years, many disappearances have remained unexplained.

07:43Boats and even planes flying without a trace.

07:46The lakes, often calm on the surface,

07:49often proved dangerous with unpredictable storms and large waves,

07:53leading to these numerous disasters.

07:56Not to mention all the scary things observed there over the centuries,

08:00like the ghostly lights above the water

08:03or strange meteorological phenomena such as disturbing fogs

08:07that seem to arise from nowhere.

08:10In 2007, a prehistoric structure,

08:12a bit like Stonehenge,

08:14was even discovered in the lake,

08:16although it is much smaller.

08:18It was located about 12 meters below the surface,

08:21at the heart of the Great Lakes.

08:23It is estimated that it would be nearly 9,000 years old,

08:25much older than Stonehenge.

08:27It seems to be a footprint of those who lived in this region

08:30millennia ago.

08:32These massive stones are arranged according to a sinuous pattern

08:35extending over more than a kilometer.

08:37They vary in size, ranging from that of a basketball ball

08:40to that of a compact car.

08:42However, one of them stands out particularly.

08:46A rock measuring between 1.10 and 1.20 meters in height

08:50and 1.50 meters wide,

08:52decorated with the image of a mastodon,

08:54a creature that traveled the Earth

08:56about 11,000 years ago before disappearing.

08:59It is likely that it sank to this place

09:02at the end of the last ice age,

09:04mentioned a little earlier.

09:06This period profoundly remodeled the region.

09:09While this location is now submerged,

09:11it was at the time of solid ground.

09:14So these stones seem to have been created

09:16by the people who lived in the place,

09:18although their function remains uncertain.

09:20Was it a hunting ground?

09:22Or was it an old calendar?

09:24Who knows?

09:26Barely 15% of the bottom of the Great Lakes

09:28has been explored.

09:30Today, scientists are preparing to carry out

09:32much more in-depth research,

09:34both literally and metaphorically.

09:37They want to analyze the bottom of the lake

09:39that surrounds these craters,

09:41in the hope that some elements

09:43present in their environment

09:45could be at the origin of their formation.

09:47They are leading initiatives such as

09:49the Lakebed 2030,

09:51aiming to map the entire underwater landscape.

09:53This would allow us to learn a lot

09:55about Lake Michigan

09:57and the past of our planet.

09:59Who knows what secrets these dark waters

10:01could still reveal to us?

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