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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