The ocean is like outer space, vast and large. It beckons, calls, evokes romantic fantasies. But in fact, the ocean is not only romance, but also a force that man has every reason to fear. 
When carrying out secret missions, military divers have to spend a lot of time underwater, motionless, waiting for the right moment. To do this, during training they are specially taught to get used to being in pitch darkness for hours, where strange large objects bump into them.” 
The largest migration of biomass on the planet occurs every night when deep-sea animals come to the surface to feed. 
Clinging to the wreckage of stranded sailors at sea, their skin dissolves in the salt water after 3 days at sea. 
The sonar that humans use to map deep-sea features is harming a range of species, especially whales, dolphins and porpoises. The powerful sonar disrupts their own sonar abilities, leaving them unable to communicate and navigate for some time. 
At the bottom of the Black Sea there are perfectly preserved sunken ships of Ancient Greece. At great depths, seawater becomes oxygen-free, which preserves organic materials such as wood. 
94% of the total volume of the Earth's oceans is complete darkness. 
When a whale dies, an entirely new ecosystem is created in its remains on the ocean floor. 
The ocean is blue because all other colors in the spectrum are absorbed by water. Thus, after a certain distance into the interior, everything around you is painted a monotonous blue color, unless you have another light source. Bizarrely, if a diver gets cut underwater, the blood appears black as ink. All the rays from the red part of the spectrum have long since been absorbed, so there aren't enough wavelengths left in the depths to show you the red color when you bleed. 
More people have died in the ocean than you will meet in a lifetime. 
“What I tell new scuba divers is this: the ocean doesn’t care about you. He's not trying to kill you. But it itself does a lot of things that will absolutely kill you if you're not prepared and careful. I understand that this can be applied to any natural environment, but it is much more relevant when it comes to the ocean. One wave you are not prepared for can end you. This is normal for the ocean." 
It is estimated that there are 3 million shipwrecks in the ocean and about 100 large ships are lost without a trace every year. 
“Jacuzzi of Despair” is the name of a lake under the ocean in the Gulf of Mexico. Methane is dissolved in large quantities in a concentrated saline solution of its waters. Any creature that gets there will die 
Most plastic pollution in the ocean comes not from straws, bags or bottles as many people think, but from fishing nets and fishing gear. 
Just one milliliter of coastal water taken from the ocean surface can contain up to 10 million viruses. The number of viruses decreases with distance from the coast. 
Every ocean is a huge graveyard, and we all float in it, not knowing whether we are destined to rest there. 
There are parts of the ocean that are literally dead: there is no oxygen in their water, which means that nothing can survive there - not fish, not plankton, nothing at all. They are growing exponentially and will cause serious problems before the end of the century. 
There are no fewer aircraft in the ocean than there are submarines. 
"He doesn't hate you. He doesn't love you. He doesn't even know you exist. When he capsizes your boat, it doesn't cause a change in his movements. I'm a sailor and I'm in love with this cold heartless bastard who doesn't care." whether I live or die" 
Blue whales secrete 20 liters of sperm every time they ejaculate. 
There is a garbage patch in the ocean so large that it can be seen from space. 
When sea creatures die in the ocean and their bones end up on the bottom, they are eaten by zombie worms. The skin of these worms secretes an acid that dissolves bones and digests remaining fat and protein. 
When you dip your feet into the ocean water, you are already potential prey for many underwater predators. 
It would make sense to bury people by throwing their bodies into the ocean. So not an ounce of food is wasted for needy creatures, including bones. If you bury the dead at sea, the entire body will be eaten, which is beneficial for the ecosystem as a whole. 
Many sea monsters were first invented by science fiction writers, and only then scientists found exactly similar creatures on the ocean floor. It’s scary to even think what other undiscovered horrors might live there. 
To date, scientists have explored only 1% of the ocean floor. We know more about the surface of Mars than the bottom of our oceans
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