The sounds of the abyss: What did scientists hear at the bottom of the Pacific Ocean?

Mysterious audio recordings from a depth of 11 km
The Pacific Ocean is one of the most mysterious and unexplored corners of our planet. Its depths hide many secrets, and perhaps the most mysterious of them lie at the bottom of the Mariana Trench - the deepest point of the world's oceans. Recently, a scientific expedition armed with sensitive sound equipment lowered underwater microphones to a depth of about 11 km, and the resulting recordings shocked scientists: the recordings were heard sounds that do not resemble any of the known sounds of nature or human activity.
These audio recordings are a set of low-frequency and high-frequency noises that scientists say are difficult to explain. Some of the sounds resemble distant moans or even “voices” heard through a layer of water and crushing darkness. Some sounds are similar to echoes of deep vibration, while others produce piercing tones, similar to high-frequency waves, which, it would seem, could not occur in such harsh conditions.



Analysis of sounds unlike anything known
Acoustics, oceanographers and even cryptozoologists have been recruited to analyze sounds to try to understand the nature of the phenomena heard. Careful analysis showed that the sounds had resonant frequencies that did not correspond to biological noises or sounds from underwater earthquakes or eruptions of underwater volcanoes. Experts studying marine acoustics have hypothesized that these sounds may have arisen due to geological processes, but the intensity and rhythm of sounds do not fit into existing models.
Some scientists have suggested that it could be an acoustic echo from underwater structures that reflect sound waves. But even this theory does not provide a complete explanation, since the detected sounds change in tone and structure, which is more like an “intentional” sound manifestation. The finding raised many questions: If the sounds are not natural, what could have caused them?

Theories about Ancient Civilizations
One of the most unusual theories that appeared against the background of this find is the hypothesis about the traces of an ancient underwater civilization. Some researchers believe that the ocean may have been home to a highly developed culture that existed thousands and possibly millions of years ago. Protected by thick layers of water and darkness, the hollow could be an ideal refuge for hidden civilizations whose technological advances could leave sonic "traces" in the depths.
Proponents of this theory point to some artifacts and structures found at the bottom of the ocean that have no explanation yet. For example, the famous underwater structure of Yonaguni, found off the coast of Japan, still causes controversy: is it an ancient city, flooded millions of years ago, or just a bizarre formation of rocks? Perhaps the sounds from the Mariana Trench are just the last “echoes” of an ancient civilization that disappeared forever under water.

Reaction of the scientific community
The scientific community reacted to the finding very controversially. Many scientists are skeptical of the idea of an ancient underwater civilization, believing that the cause of the sounds can be processes in the earth’s crust or the influence on the recording of sound equipment. Oceanographers emphasize that the study of the deep ocean trenches is still in its early stages, and there is a possibility that the sounds come from sources that have not yet been detected.
However, there are those who are slow to reject theories about unknown forms of life or civilization. Rumors of giant squids and other giant sea creatures living at great depths inspire scientists to search and experiment, trying to understand the nature of unusual noises. The ocean remains underexplored, and something incredible may be lurking in its darkness.

Conclusion
The sounds heard by scientists at the bottom of the Pacific Ocean remain a mystery. What did they hear: echoes of underwater processes, sound waves refracted by ancient structures, or perhaps remnants of a distant civilization? There is still a lot of research and attempts to find answers. In any case, the mysteries of the Mariana Trench continue to inspire both scientists and ordinary people, giving hope that the ocean will one day reveal its deepest secrets.