The difficulty of scientists in uncovering the mysteries of the ocean lies in their limited technology and knowledge. The high cost of research is also a constraint in revealing these ocean mysteries. Collected from various sources, here are 8 ocean events that still remain a mystery until now.

Speculation about the structure involves theories of spacecraft, secret war technology, and Nazi bunkers. However, the crew that discovered the structure denied these theories because the electrical equipment died when approaching the structure. Geologists concluded that it is the Baltic Sea Anomaly, which is a glacial deposit that moved during the Ice Age. Nevertheless, to this day, the strange structure remains a mystery without a satisfying explanation.

The following is the translation of the 'Bahasa' text to 'English' while preserving any HTML tags: "The four submarines disappeared within a consecutive period of five months. Despite more than half a century passing, the cause and fate of the crews of those four submarines still remain unknown."

With a length of 50 meters and a width of 20 meters, the monument found at the southern tip of the Ryukyu Islands still invites debate whether it is the result of natural rock modifications or human construction.

The following is the translation of the 'Bahasa' text to 'English' while preserving any html tags: "This event has confused scientists for years. However, 14 years later, scientist Robert Dziak from NOAA explained that the bloop is the sound of an icequake caused by the breaking of ice layers from the Antarctic glacier. Nevertheless, this explanation is not fully accepted by some other scientists who are still searching for what caused 'the bloop'."

This ship mysteriously disappeared, but was found floating with the engine still running. Due to its mysteriousness, Kaz II was given the nickname 'Australia's Ghost Ship'. The theory suggests that one sailor fell into the sea, and when the other two tried to rescue him, they also disappeared.

This city was discovered by an underwater robot equipped with sonar lights at a depth of 700 meters. From the exploration of the underwater robot, it was revealed that there are many building debris, statues, and other signs of human life.

This trench can even submerge Mount Everest, which is the highest peak on Earth (8.8 thousand meters). There is no technology that can overcome the immense water pressure inside it. Therefore, there has been no expedition that can fully explore the depths of the Mariana Trench.

The following is the translation of the given 'Bahasa' text to 'English' while preserving any html tags: "This story was first told by the Greek philosopher Plato about 2,300 years ago, depicting a great city that sank beneath the Atlantic Ocean. Since then, various theories have emerged to explain the mystery of Atlantis. Some mention the disappearance of Atlantis in relation to the Bermuda Triangle, meteor impacts, natural disasters, or even consider Atlantis as ancient Antarctica. Others argue that Atlantis is actually just a myth and never really existed."