Naval personnel worldwide have reported bizarre underwater encounters that defy conventional explanation. Sonar operators detect objects moving at speeds that should be impossible for any known submarine or underwater vehicle. Radar systems track craft that transition seamlessly from air to water without any apparent deceleration or impact.
The USS Nimitz incident in 2004, famous for Commander David Fravor's aerial encounter with the "Tic Tac" object, included a crucial detail often overlooked: the craft appeared to be interacting with something beneath the ocean surface. Pilots reported disturbances in the water—a churning area roughly the size of a 737 fuselage—suggesting the aerial object wasn't alone.
Multiple Navy personnel have since come forward describing similar patterns. Objects detected on aerial radar suddenly vanish, only to reappear on sonar systems tracking underwater contacts. The implication is unavoidable: these craft are moving between domains with ease, suggesting technology far beyond current human capabilities.
Lieutenant Ryan Graves, who testified before Congress about routine UAP encounters off the East Coast, noted that objects would sometimes descend into the ocean and continue operating underwater. "We'd track them on radar as they went down, and then sonar would pick them up continuing at depth," he explained in interviews. The seamless transition violated everything naval aviators understood about physics and engineering.
One of the most compelling underwater UFO cases emerged from the waters near Puerto Rico. In 2013, a U.S. Customs and Border Protection aircraft equipped with thermal imaging captured footage of an object that split into two separate craft before both plunged into the ocean and continued traveling underwater at approximately 95 miles per hour.
The thermal footage showed the object maintaining consistent speed whether in air or water—a feat that should be impossible given the dramatically different resistance forces. Water is roughly 800 times denser than air, yet the craft showed no deceleration upon entry. Naval architects examining the footage struggled to explain how any vehicle could achieve such performance.
What made the Puerto Rico incident particularly significant was the quality of documentation. Multiple sensor systems tracked the object simultaneously. The thermal camera provided clear imagery. The data was timestamped and georeferenced. This wasn't a blurry photograph or secondhand account—it was military-grade sensor data confirming something genuinely anomalous.
The growing body of underwater UFO evidence represents a hidden dimension of the UAP phenomenon that researchers are only beginning to understand, with implications that may be even more profound than aerial encounters.
Reports of strange underwater phenomena extend back decades, though official acknowledgment is recent. Declassified Soviet Navy documents describe encounters with unidentified submerged objects during the Cold War. Submariners reported objects pacing their vessels at depths and speeds that no known technology could achieve.
One particularly striking account from 1982 involved Soviet naval exercises in the Pacific. Multiple submarines detected what appeared to be a formation of underwater objects moving at speeds exceeding 230 miles per hour. When Soviet vessels attempted to pursue, the objects accelerated away effortlessly, demonstrating capabilities that remain impossible for modern submarines four decades later.
Commercial fishing vessels have contributed numerous reports over the years. Fishermen describe enormous objects detected on fish-finders at depths where nothing that size should exist. Some accounts involve craft surfacing near vessels, creating massive water disturbances before submerging again and vanishing from sonar.
The consistency of these historical reports with modern military encounters suggests a persistent phenomenon rather than isolated incidents. Whatever is operating in our oceans has apparently been doing so for at least half a century, possibly much longer.
The physics involved in these underwater UFO encounters poses profound questions. Objects that transition between air and water without deceleration would need to overcome fundamental engineering challenges that human technology hasn't solved.
Water entry at high speed typically creates massive cavitation—bubble formation that generates noise, drag, and structural stress. Submarines must surface slowly and submerge gradually to manage these forces. Yet USOs apparently ignore these constraints entirely, moving between mediums as easily as we walk through a doorway.
The speeds reported for underwater UFO movement exceed anything current propulsion systems can achieve in water. The fastest modern torpedoes top out around 230 miles per hour using supercavitation technology that creates an air bubble around the weapon. Even these cutting-edge systems can only maintain such speed briefly before fuel exhaustion.
USOs reportedly sustain far higher velocities for extended periods with no visible exhaust or propulsion wake. Sonar operators describe clean signatures without the acoustic noise that submarine propellers and jet propulsion systems inevitably generate. The silence itself represents a technological impossibility by current understanding.
The Pentagon's All-domain Anomaly Resolution Office explicitly includes underwater environments in its investigative mandate. The term "all-domain" acknowledges that these phenomena aren't limited to airspace but extend into maritime environments as well.
Congressional hearings have touched on the underwater aspect, though briefings about USO encounters often occur in classified settings. Representatives emerging from these closed-door sessions have expressed concern about potential threats to naval operations and the technology gap these encounters suggest.
AARO's public reports have been cautious about underwater incidents, but the office has confirmed receiving numerous reports from naval personnel describing anomalous underwater contacts. The reluctance to discuss specifics likely reflects both classification concerns and the unsettling implications of acknowledging that unknown objects routinely operate in waters the U.S. Navy considers its domain.
Some researchers propose that USOs might originate from the oceans rather than space. The ocean hypothesis suggests that an unknown intelligence could maintain bases in the deep ocean, particularly in unexplored regions like the abyssal plains or deep trenches.
Earth's oceans remain largely unmapped and unexplored. We have better charts of Mars' surface than of our own ocean floors. The Mariana Trench reaches depths exceeding 36,000 feet—an environment as hostile to human exploration as outer space. If something wanted to remain hidden on Earth, the deep ocean would provide ideal concealment.
Proponents note that many USO sightings cluster around deep ocean trenches and underwater geological features. The Puerto Rico Trench, the site of the 2013 thermal footage incident, reaches depths of over 27,000 feet. Similar concentration patterns appear near other trenches worldwide, suggesting these features might hold significance for whatever is operating there.
The revelation of thousands of underwater UFO encounters forces reconsideration of the UAP phenomenon's nature and scope. If these objects operate as comfortably underwater as in the air, they represent capabilities far more advanced than simple aircraft.
The trans-medium capability suggests either technology that manipulates fundamental physics or an intelligence that understands aspects of reality we haven't discovered. Either explanation carries profound implications for human science and our understanding of what's possible.
Questions multiply faster than answers. Are aerial UAPs and USOs the same phenomenon or distinct categories? Do they originate from the same source? If bases exist underwater, are they permanent installations or temporary outposts? How long have they been there?
As disclosure efforts continue, underwater UFO encounters may prove more significant than aerial sightings. The oceans cover 71% of Earth's surface and contain 99% of the planet's living space by volume. If intelligence operates there, it vastly expands both the scale and the mystery of what we're confronting.
The thousands of documented USO encounters represent just the beginning of understanding this hidden dimension. As technology improves and more personnel come forward, the picture will sharpen. Whether that clarity brings comfort or deeper concern remains to be seen, but ignoring the evidence is no longer viable.
The truth about what operates in our oceans may be stranger and more challenging than anything we've encountered in the skies above.
