During the latter part of World War II, the Japanese Combined Fleet and the American aircraft carrier USS Yorktown were repeatedly stalked by a mysterious submarine. However, whenever they discovered it and prepared to take action, the submarine vanished without a trace. In the midst of fierce naval battles between Japan and the United States in the Pacific War, this enigmatic submarine made several appearances. Yet, it did not engage in combat; instead, it conducted rescue operations for sailors from both sides who had fallen overboard, reminiscent of the actions of the International Red Cross. The submarine's speed and responsiveness were unmatched by any other vessels of that time, leading the U.S. Navy to label it the "Ghost Submarine."

After World War II, the U.S. Navy deployed all submarines from the Pacific Fleet to conduct four searches for the "Ghost Submarine" in the South Pacific. The Soviet Navy also took notice and sent numerous submarines to search the Pacific and Atlantic Oceans.

The year-long search yielded no results, but both the U.S. and Soviet navies paid a heavy price: each lost two to three advanced submarines.

By the late 1960s, the "Ghost Submarine" reappeared frequently in the vast waters of the Pacific and Atlantic, tracking U.S. and Soviet fleets. On one occasion, the U.S. nuclear-powered aircraft carrier USS Enterprise discovered it was being followed in the South Pacific, but just as they prepared to respond, the submarine quietly disappeared. The Enterprise dispatched several anti-submarine helicopters to search the area, but returned empty-handed.

The Soviet fleet encountered similar situations, leading both sides to suspect the other of deploying reconnaissance submarines. However, the submarine's agility left both sides astonished and frustrated. During the 1960s and 70s, the competition between the U.S. and Soviet Union in developing and expanding their submarine fleets was significantly influenced by the "Ghost Submarine."

In 1990, during a joint naval exercise between Sweden and NATO, the "Ghost Submarine" boldly surfaced, leading to a massive hunt. Over ten submarines and cruisers formed a comb-like formation in the Enksna Bay, turning the area into a chaotic battlefield with shells, depth charges, and torpedoes. Ultimately, the NATO forces returned disappointed, having been outsmarted by the "Ghost Submarine."

A year later, NATO conducted another exercise in the Bay of Biscay, where the "Ghost Submarine" once again appeared without fear. However, the NATO commanders were puzzled to find that all radio communications, radar, and sonar devices on their ships had malfunctioned. Once the "Ghost Submarine" vanished, everything returned to normal, leaving NATO frustrated and powerless. After its disappearance, NATO even attempted to fire several "Harpoon" torpedoes—advanced torpedoes designed to automatically track targets—but they inexplicably veered 90 degrees downward upon launch. It seemed that the "Ghost Submarine" was still nearby, restraining NATO's naval capabilities.

Consequently, NATO military researchers proposed a hypothesis: the "Ghost Submarine" might be an uninvited guest sent to Earth by aliens.

The "Ghost Submarine" appears to have several types. The most commonly seen type resembles American nuclear submarines but is more sophisticated. In 1992, French diving expert Ramasque discovered a shiny silver-gray cylindrical structure during an underwater exploration in the Caribbean. It spun rapidly and silently passed by Ramasque, creating no waves. This might be another type of the "Ghost Submarine!"

Is there a base for the "Ghost Submarine" in Earth's waters? Logically, there should be one. Some suggest it is located beneath the Bermuda Triangle, near the Bahamas.

In 1985, American underwater explorers discovered a massive underwater structure 1,000 meters deep near the Bahamas, where machines seemed to be rumbling.

In July 1993, American and French expert teams discovered a gigantic underwater pyramid in that area. The pyramid's base measured 300 meters long and stood about 200 meters high, with its peak just 100 meters from the surface. The pyramid had two enormous openings, with water flowing in and out at an astonishing speed, creating a misty and turbulent sea surface. Many believe that the numerous aircraft and ships that have disappeared in the Bermuda Triangle are linked to this underwater pyramid.

Researchers studying the "Ghost Submarine" argue that the underwater pyramid is the ideal base for it, with the two large water openings serving as entry and exit points.

Some Russian researchers believe that just from the existence of the "Ghost Submarine" and its base, the intelligence of its owners surpasses that of humans. Moreover, the "Ghost Submarine" has never attacked humans, while humans have continually attacked it, yet it never retaliates. This indicates that the beings piloting the "Ghost Submarine" possess a moral civilization far superior to that of humanity.

According to declassified Soviet military documents, the "Ghost Submarine" often operated in conjunction with unidentified flying objects (UFOs) in the Arctic region. In the late 1960s, a "Ghost Submarine" was discovered trapped in ice near the Kola Peninsula in the Soviet Arctic. All Soviet military instruments suddenly malfunctioned, and UFOs descended freely. At that moment, the UFOs approached the "Ghost Submarine" to help break the ice, allowing it to escape.

This situation led the Soviet military to realize that the "Ghost Submarine" was a creation of extraterrestrials, not an invasion by Americans. Given that the "Ghost Submarine" never harms humans, Colonel Henry Rod of the U.S. Navy's intelligence division speculated that the ships, planes, and personnel that disappeared while tracking the "Ghost Submarine" or navigating the Bermuda Triangle were merely captives of the aliens, who would eventually return safely.

Researchers further suggest that after aliens arrive on Earth, they can be broadly categorized into two types: those who operate on land and those who operate underwater. Perhaps they were originally divided into these two categories on their home planet? The underwater aliens constructed the "Ghost Submarine" (or brought it from their home planet) and use the underwater pyramid in the Bermuda Triangle as their operational base. Thus, since World War I, reports of unidentified maritime objects—the "Ghost Submarine"—have periodically surfaced across the oceans, particularly in the Pacific and Atlantic.

Other researchers believe that deep in the ocean, there has long existed a highly civilized and intelligent species. They are not aliens but rather close neighbors of humanity, representing another type of Earth-dwelling beings. They can survive in both "air's ocean" and "ocean's air." The large pyramid in the Bermuda Triangle is merely an electromagnetic network built for power generation. Proponents of this view emphasize that humans originated from the ocean, and many modern human habits and organs retain traces of this origin, such as a preference for salt, hairlessness, swimming ability, and a taste for fish. These characteristics are not found in terrestrial mammals. During human evolution, it is possible that humans diverged into two branches: one on land and the other underwater. The land-dwelling branch became humanity, while the underwater branch became known as "sea monsters." The "sea monsters" created the "Ghost Submarine," which humans cannot replicate.

Researchers also believe that to fully unravel the mystery of the Bermuda Triangle and the "Ghost Submarine," humanity must reach a level of scientific and moral civilization that can communicate with the "sea monsters." However, how long will it take to reach that day? It is important to note that while humanity progresses, the "sea monsters" are also evolving, and perhaps at a faster pace than humans!