If we talk about the reasons why mankind knows so little about the life of the sea, they lie in the fact that we are still not able to explore its depths - modern civilization does not yet have such technologies.
Water depths beckon and frighten us
It’s probably no secret to anyone that life on Earth originated in the sea. Moreover, land still occupies only a quarter of the planet's territory, and it can be considered only as a 2D projection, while the ocean is a volumetric world extending in some places to a depth of eleven kilometers (Mariana Trench). Although humanity still cannot say with certainty whether there are even greater depths, not to mention the alleged underground water reservoirs at great depths (1000-1500 kilometers), which are most likely connected by passages to the World Ocean. And there can also be life (quite recently, scientists proved that there are such reservoirs in the thickness of the earth's crust, and there are hundreds of times more water reserves than in the world's oceans).
And why, in our human pride, do we think that reason cannot exist in this enormous watery world? Only because we ourselves can hardly sink in the bathyscaphe to a depth of six kilometers, where, in our understanding, all life ends. It is easier for us to fly into space and even to the moon four hundred thousand kilometers from Earth than to go down ten kilometers under water. And even there we can no longer see anything due to the impossibility of illuminating the icy darkness around the bathyscaphe at any reasonable distance, allowing us to study the surrounding space.
In the same Mariana Trench, we, faced with some fantastic phenomena that do not fit into the framework of our ideas about the physical world, and even there, noticing life that is terrible and incomprehensible to us, we continue to believe that we are the only intelligent beings on the entire planet.
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There is intelligence in the depths of the ocean
There are two hypotheses for the existence of reason in the World Ocean. On the one hand, there may be a terrestrial underwater civilization, most likely much older than ours, and therefore more developed. On the other hand, there may be huge colonies of aliens under the water, who perfectly understand that we will never (at least not soon) get to them. However, why not assume that both are under water, and they coexist well, because in terms of development they are more suitable for each other than aliens and earthlings living on the surface of the planet.
Orthodox science still denies the existence of mermaids (although they were even caught), cannot explain where sea monsters, say, Karadag snakes come from in the ocean, tries to keep silent about the fact of flight and departure (and without any noise and water resistance) from the depths of ships aliens, and more.
Throughout the last century, sailors of, say, the expedition ship Vladimir Vorobyov, observed fantastic circles (rotating wheels) of light in the ocean, reaching a diameter of several hundred meters.
And this is what the great Thor Heyerdahl describes, who traveled across the ocean on his famous Kon-Tiki raft. Near the raft, he wrote, round heads protruded from the black water several times and carefully examined us with their sparkling, clearly intelligent eyes. Moreover, it was also some kind of hypnotizing glances, from which it became somehow uncomfortable. We also constantly saw in the depths strange burning balls that flashed and then died out, like an electric bulb.
On one quiet night, a luminous object appeared under the raft, which Thor Heyerdahl christened a sea ghost, since it took various forms, divided into several parts, and rejoined. And all this, as if playing, swam under sea travelers for several hours, although it kept quite deep under water.