The average depth of the global ocean is estimated to be 3700 meters, and the deepest point is 1 1000 meters. Although the satellite has mapped nearly 100% of the seabed, the resolution is very low. The seabed map drawn with the highest resolution is less than 0.05%, and the seabed actually explored is even less.
Therefore, there are still unknown things hidden in the mysterious underwater world. Previously, amateur underwater archaeologist Mac McIver discovered a mysterious underwater structure on the bottom of the Pacific Ocean through Google Earth:
This mysterious building is located about 80 kilometers northeast of Corcos Island on the west coast of Costa Rica. The water depth here is 1800 to 2000m. Is it a natural building, an ancient building built by a disappearing prehistoric civilization, or a little-known modern building?
According to the measurement, the length of the building extending from one side to the other reaches 130 km. The width of each stripe can reach 8 kilometers, and there are shadows on both sides. It can be considered that they are obviously higher than the seabed. So, what is this building?
If carefully distinguished, it looks like a modern airport, and the layout of the two is strikingly similar. The only difference is that one is above sea level and the other is at the bottom of the sea. If that's an airport, why should it be built under the sea?
One view is that these structures may only be abnormal during sonar detection, not buildings. The stitching of submarine side scan sonar photos will produce stripes.
Another view is that this suspected airport building may have been built by prehistoric civilization with advanced technology. Long ago, that part of the ocean was actually land. But I don't know why, it may be violent crustal movement or prehistoric war, which led to the collapse of prehistoric civilization and the sinking of buildings into the deep sea.
On earth, there have been cases where land sank into the sea. 80 million years ago, Gondwana separated a piece of land and finally sank to the bottom of the sea. This is Sri Lanka, which is located in the east of what is now the Australian mainland. Scientists first confirmed the discovery of West Lanzhou in 20 17, which is considered by some to be the eighth continent on earth.
Besides the sunken land, there are legends about underwater civilizations, such as Lemuria and Atlantis. According to some ancient books, these ancient civilizations were once very prosperous, but they were destroyed by floods 10 thousand years ago and finally sank to the bottom of the sea.
However, it is impossible for these ancient civilizations that sank to the bottom of the sea to build the so-called airport, because the ancient civilizations at that time, like the ancient Greek civilization at most, did not develop modern technology. Moreover, this suspected airport building is too huge, and the take-off and landing planes are overqualified.
So, can this be a masterpiece of prehistoric technological civilization or alien civilization?
At present, this assumption is unlikely to hold water. There is no more reliable evidence that there have been many intelligent species and technological civilizations on the earth, or that alien civilizations have been to the earth in ancient times. The mainstream view holds that there is no reincarnation of earth civilization, and human civilization is the first intelligent civilization that has appeared on the earth in 4.6 billion years.
If you want to find out what the huge submerged structure is, when it was built, or whether it was formed naturally, a reliable way may be to dive to the seabed there for a comprehensive exploration.