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74-year-old wreck of Pan Am plane found off Puerto Rico
Researchers have located the wreck of Pan American World Airways' Clipper Endeavor off Puerto Rico at a depth of 610 meters. The plane crashed into the Atlantic in 1952, and the accident played a critical role in the creation of modern flight safety regulations.
Researchers have discovered the wreck of a Pan American World Airways plane that disappeared 74 years ago on the ocean floor. A team from the Air/Sea Heritage Foundation, Deep Sea Vision, and Discovery Channel's 'Expedition Unknown' program imaged the remains of the Douglas DC-4 Clipper Endeavor using a sonar-equipped drone on June 2, 2026, off the northern coast of Puerto Rico, at a depth of 610 meters. The wreckage includes the aircraft's fuselage, tail section, and the still-readable Pan Am logo along with the name 'Clipper Endeavor'.
Disaster shortly after takeoff
On April 11, 1952, the Clipper Endeavor, under the command of Captain John C. Burn, took off from Isla Grande Airport in Puerto Rico bound for Idlewild Airport (now John F. Kennedy Airport) in New York. However, immediately after takeoff, trouble arose in the right wing's engines. First, the No. 3 engine began vibrating and losing power. While the pilot was maneuvering to return to the airport, the No. 4 engine on the same wing also failed.
With both engines disabled, the plane rapidly lost altitude. Captain Burn declared an emergency and ditched in the Atlantic Ocean. The ditching, made worse by strong winds, was extremely violent; the aircraft's tail broke off from the fuselage and the cabin began flooding. All 69 people on board were alive at the moment of impact, but intense panic caused many passengers to refuse to leave the sinking plane.
Only 17 of the 69 passengers and crew were rescued; 52 went down with the aircraft.
Turning point in aviation safety
The Clipper Endeavor accident was a watershed moment in aviation history. Investigations after the crash revealed that the death toll was higher because passengers were not adequately informed about emergency procedures. This finding led to a fundamental change in civil aviation regulations. Airlines were required to have cabin crew demonstrate emergency exits and life jackets to passengers before every flight. This practice, now standard worldwide, continues to ensure the safety of millions of travelers.
Decade-long search yields results
Marine researcher and historian Russ Matthews began investigating this little-known crash in 2019. By examining detailed reports from the U.S. Civil Aeronautics Board and a map drawn by pilots who witnessed the accident, he narrowed the search area. The team's first expedition in 2024 was cut short by bad weather, but the 2026 attempt proved successful.
Sonar scans determined the wreck's precise location. The 'Expedition Unknown' team's historic discovery will be shown in a special episode on Discovery Channel this fall.
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