This so-called crystal castle is paved with crystal blocks that resemble marble. Pen & Fun & Pavilion www.biquge.info on the roof of the circular building, installed with a radar-like antenna, but there is no figure in the city, Dr. Rotan hurriedly grabbed the camera with an underwater camera, but suddenly an unknown underwater turbulence surged, pushing him and the submersible away from this beautiful underwater city. Since then, Dr. Rotan has never been able to find this "crystal palace" under the sea, and the captured footage is blurred, and he can only faintly see the shadow of the underwater castle.

In July 1993, some British and American scholars claimed to have discovered two giant "pyramids" about 1,000 meters from Bermuda in the Atlantic Ocean. The pyramid found is said to have been built with crystal glass and is about 100 meters wide and 200 meters high. However, when people heard the news and returned to these sites again, the legendary underwater structure had disappeared without a trace......

......

The true identities of these so-called USOs have also caused an uproar in the scientific community, and different opinions have emerged. But in recent decades, due to the rapid development of science and technology and military power, some people prefer to believe that the so-called USO is just a human-made submarine.

This is because, during the Second World War in the 20th century, unidentified diving objects appeared frequently!

The difference is that the shape of the unidentified diving objects at this time is very different from those of the last century, and they are very similar to the submarines made by modern humans!

Due to the special function of submarines in naval warfare, after World War II, many countries competed to develop conventional submarines and nuclear submarines. And the United States and the former Soviet Union are far ahead in this regard!

However, these two masters have never admitted to creating those "ghost submarines" like USOs.

Because it turns out that no matter how advanced the submarines they develop, they are far inferior to the ghost submarines. In addition, in order to study and learn from the advanced points of ghost submarines, the United States and the former Soviet Union have also launched a tracking and search for ghost submarines......

......

In June 1942, during the Battle of Midway in the Pacific Ocean, Japan's Combined Fleet and the U.S. aircraft carrier USS Kitty Hawk engaged in a fierce battle, and a mysterious submarine watched quietly from the side. But when it was discovered by both sides and mistaken for an enemy ship, they both attacked it, but disappeared without a trace. When the US and Japanese ships fought fiercely in the Mariana Islands, this mysterious submarine reappeared, but it was still only "watching from the sidelines" and did not support either side. An even stranger thing is yet to come: when a Japanese ship was hit by a bullet and exploded, and the sailors jumped into the sea to escape, the mysterious submarine immediately approached the scene and rescued many officers and men. Then, it drove a little farther away, let the officers and men sit in two lifeboats, and lowered the boats into the sea before quietly driving away. What made the rescued officers and men even more puzzled was that during the whole process, they never saw anyone on the submarine, only a voice from a horn commanding them. Moreover, the speed and various other characteristics of this submarine were incomparable to all the most advanced ships of the time!

After the end of the war, the U.S. intelligence department conducted a special investigation into the matter, but there was no result, and only the United States, Germany, Japan, and a few other countries had submarines at that time, but Germany and Japan denied that they had sent submarines to these naval battle sites......

......

The US Navy has repeatedly used almost all of the Pacific Fleet's submarines, submarine hunters, and other warships, and even aircraft to carry out four large-scale search operations for "ghost submarines" in the waters of the South Pacific. Not far behind, the Soviet Navy sent a large number of ships and aircraft to conduct careful searches in the Pacific and Atlantic Oceans. The search lasted one year before and after, and the result was like a needle in the bottom of the sea, and the two countries paid a great price for it, with two and three advanced submarines missing respectively......

......

By the beginning of the 60s of the 20th century, ghost submarines frequently roamed the vast waters of the Pacific and Atlantic Oceans, tracking warships of the United States, the former Soviet Union, and even other countries. At one time, the USS Enterprise was spotted in the South Pacific and was about to react, when the USS Enterprise was found to be tracked and was waiting to respond, when the other side quickly disappeared from the location of sonar and detectors. "Enterprise" sent several anti-submarine helicopters to search everywhere and dropped a number of depth charges, but in the end they found nothing. And the fleet of the former USSR had a similar situation.

For a time, the United States and the former Soviet Union even suspected that the ghost submarine was built by the other, but they did not believe that the other side could reach such a high level of technology and surpass their own by so much.

The most puzzling thing happened in 1990, when dozens of NATO warships were conducting military exercises in the North Atlantic. Suddenly, someone has spotted another ghost submarine!

The warships immediately interrupted their planned exercises and threw themselves into the hunt for ghost submarines. They fired a lot of torpedoes and depth charges at the ghost submarines!

But, strangely, the bombs couldn't get close to the ghost submarine at all, and when they did, they swerved to the side and rushed into the distance. When the unscathed Ghost submarine surfaced, all of the ship's radar, sonar, and other communications systems failed until it left......

......

To this day, the sightings of USO are still emerging. As for where they came from, who made them, and so on, it is still difficult to determine how to do so.

Some people don't believe in the existence of USO at all, believing that the objects they see are nothing more than very large fish.

It is also believed that these unidentified diving objects were created by a military power or some mysterious military organization.

Some people believe that these ghost submarines are actually from outer space, and are made by alien civilizations that have established bases in the waters of the earth.

What's more, there are still people who are convinced that this USO is made by another intelligent creature on Earth!

And these intelligent beings may have been living in the bottom of the sea since ancient times, and they are a branch of earthlings like us humans.

Those who hold this view emphasize that humans originated in the oceans, and when humans evolved, it is likely that some of them went ashore and some remained in the water, and developed a civilization that was more advanced than its counterparts on land!

In short, there are still different opinions......

......

Wan Sanyi has compared the old man for a long time, and he knows everything and says everything......