The last transmission was unremarkable: a position report, a fuel estimate, an expected arrival time. Nothing in the pilot's voice suggested anything was wrong. Twenty minutes later, when the aircraft failed to check in again, the silence itself became the only evidence anyone would ever have.
It was a small research flight, mapping ocean current patterns along a route it had flown dozens of times before. The search that followed covered thousands of square miles of open water for eleven days and found nothing — no oil slick, no floating debris, no emergency beacon signal. The ocean at that depth simply doesn't give much back.
A case built entirely on absence
Without wreckage, investigators had almost nothing to work from beyond the last known heading and fuel load. Every theory that followed — mechanical failure, sudden weather, a navigational error compounding over open water with no landmarks — remained exactly that: a theory, never confirmed and never ruled out.
Modern side-scan sonar has since mapped most of the search area without finding anything conclusive, and the team that maintains the case file believes the aircraft likely drifted, on descent, well outside where anyone originally looked. Fifty years on, it remains one of the few disappearances in the region with no accepted explanation at all.