Transmedium Object — Pacific Naval Zone

This DoD file documents what AARO describes as a 'transmedium' UAP event — an object that transitioned from air to water to air without loss of speed or structural compromise. The object was initially tracked by naval radar descending toward the ocean surface at high speed. Rather than impacting the surface, it entered the water without the deceleration expected from fluid dynamics. Sonar operators tracked the object at 900 meters depth moving at speeds incompatible with any known submarine or underwater vehicle. After 11 minutes, the object re-emerged from the ocean and accelerated to hypersonic speed. The entire sequence was tracked across multiple sensor platforms. The 2026 file notes: 'This event defies known physics of fluid dynamics and aerodynamics simultaneously. No prosaic explanation has been identified.'