In 2019, the USS Omaha — a Freedom-class littoral combat ship operating off the coast of California — documented a UAP event that changed the institutional language of US government UAP investigation. An aerial object was tracked on sensors and then entered the water. The “splash” was captured. What had been aerial became submerged. This is the definitional transmedium event.
What Was Documented
The USS Omaha’s sensor systems tracked an object operating in airspace above the ship. The object then descended and entered the ocean. The entry — the splash — was captured on the ship’s sensors. No debris surfaced. No submarine was operating in the area. The USS Omaha event is distinguished from aerial UAP encounters by this single documented fact: the object transitioned from one medium to another. It was air-capable and water-capable in the same event sequence.
Why “Transmedium” Changes Everything
An object that can operate in both air and water without damage or loss of function does not correspond to any known human vehicle category. Aircraft cannot survive ocean entry at operational speeds. Submarines cannot operate in air. A vehicle capable of both requires propulsion physics that currently have no public engineering equivalent. The Tic Tac UAP, documented by the USS Nimitz carrier group in 2004, demonstrated anomalous aerial performance. The USS Omaha event demonstrated anomalous medium transition. These are two different anomalous capability sets, both documented by US naval sensor systems.
AARO’s All-Domain Classification
The Department of Defense’s All-domain Anomaly Resolution Office (AARO) defines the objects it investigates as “all-domain” — explicitly including aerial, underwater, space, and transmedium. This is not accidental language. “All-domain” is a direct institutional response to events like the USS Omaha. The US government now officially acknowledges that UAP operate in undersea domains and that transmedium transition is a documented characteristic of some reported objects. AARO’s reports are currently the only official government documentation where transmedium UAP are formally discussed.
The Soviet Parallel
Soviet submarine logs from the 1970s and 1980s document objects entering and exiting the ocean in Pacific and Atlantic operational zones. The Kvaker acoustic phenomenon tracked Soviet submarines while remaining underwater. Lake Baikal encounters involved objects operating at depth without surface entry or exit events. The USS Omaha 2019 event is the US military’s formal, sensor-confirmed documentation of what Soviet commanders had been reporting in classified logs for decades. The phenomenon crosses superpower boundaries and Cold War divides. It is not American, Russian, or Chinese. It predates the governments now acknowledging it.
Sources: AARO all-domain reporting. USS Omaha declassified footage. Black Vault USS Omaha case file. USNI analysis. Pentagon UAP Task Force reporting.