Autonomous sonar survey locates wreckage of Pan Am flight that prompted airline safety reforms
Nearly 75 years after it crashed, the wreckage of a Pan American Airways aircraft has been located and surveyed nearly 2,000 feet (610m) below the Atlantic Ocean off the coast of Puerto Rico. A Kongsberg HUGIN autonomous underwater vehicle, equipped with advanced sonar, detected the aircraft's fuselage and tail during the first pass of the search area, with a follow-up photographic survey later confirming the identification. The expedition was led by the Air/Sea Heritage Foundation and Deep Sea Vision, a subsidiary of Eco Minerals Inc., in partnership with the Discovery Channel's Expedition Unknown and several other organizations.
The Clipper Endeavor, a Pan Am DC-4, went down on 11 April 1952 following multiple-engine failure shortly after takeoff, forcing the pilot into a violent water landing. The aircraft was carrying 64 passengers and five crew bound for New York. Everyone survived the initial impact, but as the plane rapidly sank, passengers struggled to locate life vests and rafts. Of the 69 people on board, only 17 survived. The confusion that followed became a catalyst for new regulations requiring better flotation equipment on aircraft and pre-flight briefings on how to use it.
Map drawn by air force pilots
The breakthrough came after researchers uncovered records from a public hearing in Puerto Rico, including a map drawn by air force pilots who had witnessed the crash. Combined with historical weather data from the time, this narrowed the search area to roughly 10 square nautical miles of seabed. An earlier attempt to locate the wreckage in 2024 was abandoned due to poor weather, but the team was determined to return before the crash's 75th anniversary.
The wreckage, found broken into two sections, was located during the search area's first pass on 2 June. The subsequent photographic survey revealed that the Pan Am logo and the aircraft's name were still visible on the fuselage, providing remarkably intact confirmation of the find.
"We are all stunned and elated by this discovery, yet also humbled to remember what happened in that place so long ago," said Russ Matthews, president of the Air/Sea Heritage Foundation.
