Ce Lac Semble Calme, Mais Il Possède De Sombres Secrets

Sympa

Une éruption limnique, ou renversement de lac, est une catastrophe naturelle extrêmement rare où un lac libère soudainement une immense bulle de dioxyde de carbone (CO2) dissous provenant de ses profondeurs. Ce nuage de gaz peut suffoquer la faune, le bétail, et même des personnes à proximité. Cela se produit lorsque une activité volcanique ou un glissement de terrain perturbe les eaux profondes riches en CO2, les faisant monter rapidement et libérant le gaz. Reconnaître une éruption limnique imminente peut être difficile, mais certains signes peuvent inclure des bulles inhabituelles dans le lac, des poissons morts, ou un changement soudain de couleur du lac. Et si vous le voyez, il vaut mieux en rester éloigné.  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 Monoun Lake of Cameroon, seemingly peaceful, is a real trap.

00:06At first glance, it may seem calm and serene,

00:09but this lake is like a volcano that is waiting for one thing,

00:12to erupt.

00:15And it will do so, in general, without warning.

00:18Its last eruption dates back to 1984,

00:21and caused an explosion that left everyone panicked.

00:26It's as if this lake was a can that had just been shaken.

00:29Technically speaking, we're talking about limnite eruptions.

00:34This rare phenomenon occurs when gas from the depths suddenly erupts.

00:39For this to occur, a number of factors must be brought together.

00:43Do you worry? You can be attentive to certain signs.

00:47First of all, if the vegetation around a lake is a little flattened,

00:51it is possible that there has already been a limnite eruption.

00:56Indeed, water can arise with immense pressure and overflow.

01:00If you feel that the water is suddenly a little warmer,

01:03you must quickly take shelter.

01:08There is this lake in Kazakhstan.

01:10On the surface, it's a real disaster.

01:13With empty tree trunks coming out of the water, it's not pretty to see.

01:18But if you have the courage to swim there,

01:20you will be transported to a completely different world.

01:25Its history dates back to 1911,

01:28when a landslide filled the rainwater valley,

01:32completely submerging a local forest.

01:36As fascinating as it may seem, it's not easy to dive there.

01:40The water is icy, and the algae, plants and trees submerged

01:45make it a real obstacle course.

01:49Have you heard of this burning lake

01:51located on the sunny island of Dominique in the Caribbean?

01:55Near the banks, the water can reach temperatures

01:58between 82 and 92 degrees Celsius.

02:02No wonder no one has yet had the courage to measure the center of the lake.

02:07Of course, the heat can drop from time to time,

02:10but who knows when these waters will start boiling again?

02:15In addition, this place is full of harmful gases.

02:20Because of them, let's say it doesn't really smell like roses,

02:23but rather rotten eggs.

02:26So, unless you want to look like a boiled lobster,

02:30I advise you to go swimming elsewhere.

02:35If you plan a trip to Tanzania,

02:37you should think twice before diving into Lake Natron.

02:41Sure, it has a beautiful reddish hue,

02:44but it's because of the bacteria that live there.

02:47And let's not even talk about the pH levels,

02:49they are so high that they could discolor your swimsuit.

02:55But at least the flamingos like it.

02:58These birds love acidity and live their lives

03:01in a community of 2.5 million pretty feathered animals.

03:05You may be wondering how these birds manage to survive in this place.

03:10It's quite simple.

03:11The absence of predators is synonymous with the absence of stress,

03:15which facilitates reproduction.

03:17And they love these little bacteria that make their waters pink.

03:22You may think that the great blue hole of the Belize is welcoming

03:25with its dazzling blue shades and its proximity to the mainland.

03:30But you can put your palms away, there is a hiccup.

03:33Sure, it measures about 275 meters in diameter and 90 meters in depth.

03:38But under the surface, there is a whole network of tunnels

03:41filled with corals and wild animals.

03:44It's like trying to find your way in the labyrinth of an amusement park,

03:48but with fish in addition.

03:50And as if that were not enough, the more you go down,

03:53the less you will meet creatures.

03:55Why, you ask me?

03:57Well, it turns out that a layer of hydrogen sulfide

04:01covers the entire width of the hole,

04:03and that there is therefore no oxygen.

04:08Are you planning to go to the Devil's Kettle Waterfall in Minnesota?

04:13It is not necessarily dangerous,

04:15but you risk losing some of your stuff if you are not careful.

04:19Indeed, this waterfall presents a phenomenon

04:23that leaves geologists perplexed.

04:27A part of the waterfall flows normally,

04:30while the other part disappears into a large hole.

04:33And hold on tight,

04:35the ping-pong balls do not manage to escape it.

04:38Scientists decided to investigate,

04:40and they went as far as using GPS tracers.

04:44At first, they could not understand,

04:47but they realized that the hole acted like a gigantic mixer.

04:53The pressure of the water is such that it destroys everything in its path.

04:57By measuring the volume of water,

04:59they were able to see that it remained equal,

05:02and that the water had to come out somewhere.

05:06The most probable explanation

05:08is that the water reappears in the stream located under the waterfall.

05:14You have certainly heard of the Bermuda Triangle,

05:17but let me tell you about an aquatic trap located in the Pacific Ocean.

05:22The Devil's Sea.

05:25It's like a hide-and-seek game,

05:27but with ships.

05:28They disappear and are never found.

05:31The Kayomaru No. 5 was on a mission to investigate on a volcanic island.

05:36But the trip turned out to be unique.

05:40We now know that the Devil's Sea is more of a myth than a reality.

05:45But it does not take away anything from the interest of history.

05:51And if you are really interested in the mysterious disappearances of ships,

05:55it is on the upper lake that you have to look.

05:59Even the most competent divers could not find the slightest trace of all these missing ships.

06:04The main character of this story is a ship

06:08known under the name of SS Edmund Fitzgerald,

06:11the largest to have sunk in the Great Lakes.

06:14Today, we still do not know exactly why it happened.

06:20Did you plan to swim in one of the Great Lakes?

06:23Maybe you should avoid Lake Michigan

06:25unless you are a fan of extreme nautical sports.

06:30This bad boy has the reputation of being the most dangerous of the group.

06:35These deafening underground currents love to catch innocent swimmers.

06:41And beware of quays and yachts that only add to the difficulty.

06:46If you feel like an adventurer,

06:48avoid the months of October and November.

06:51It is at this moment that the temperatures begin to drop

06:55and that the currents are unleashed.

07:00Tibet also has its dangerous lake,

07:02and yet it is magnificent.

07:04But do not rejoice too quickly,

07:06because its salt content is so high that nothing can survive.

07:11Some villagers even consider that it is contaminated.

07:14The cherry on the cake?

07:17Other inhabitants believe that a vile creature lives in the lake

07:20and that it occupies all the space on its own.

07:23No wonder it is nicknamed Dark.

07:28And of course, we cannot forget Lake Victoria,

07:32the Great Kauna of African Lakes,

07:35and the third largest in the world.

07:38But beware, these waters are not safe for us, humans.

07:42Some regions can even be extremely risky.

07:45This lake does indeed have its own climate.

07:48What does that mean?

07:50Mainly that you should not trust it as much as it does.

07:53You can be enjoying the sun's rays,

07:56and the second after,

07:58you will have to run to shelter from the torrential rain.

08:01Unless you want to bathe in a storm,

08:04avoid this lake, it is crazy.

08:08You may have already seen photos of Lake Hillier.

08:11It's like a giant pool of pumice juice in Australia.

08:14For centuries, scientists have been digging their heads about it,

08:18because they still cannot understand why it is pink.

08:21But the bottom line is that it is not the only one.

08:24There is indeed another pink lake, Lake Retba.

08:30These two lakes have a very high salt content,

08:33which apparently attracts microorganisms called Dunaliella Salina.

08:37These little guys produce beta-carotene.

08:40You know, the substance found in carrots,

08:43it is what gives these lakes their brilliant colors.

08:46Do you want to bathe in this lake?

08:49Technically, it is not dangerous.

08:52The water is very salty,

08:54there is no creature to fear.

08:57However, you should be careful not to accidentally drink the cup.

09:02Drinking very salty water will dehydrate you faster than a plant in the desert.

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