Flight 601 had begun in Tokyo, at Haneda Airport, bound for Bangkok's Don Mueang Airport with two intermediate stops — first at Songshan Airport in Taipei, then at Kai Tak in Hong Kong. The aircraft was a Sud Aviation SE-210 Caravelle III, registration HS-TGI, built in 1960 and by this point seven years into service with nearly 17,350 airframe hours logged. Two Rolls-Royce Avon 527 engines powered it. Eighty people were aboard: 73 passengers and a crew of seven. The passengers were ordinary travelers of 1967 — businesspeople, families, individuals with their own reasons for making this particular journey on this particular day. None of them chose to land in a typhoon. That choice, and the chain of decisions that led to it, belonged to the flight deck.

The captain was Viggo Thorsen, 43 years old, with 7,800 total flight hours, nearly half of them on the Caravelle. His first officer was Sanit Khemanand, 50, with 18,400 total hours and 2,300 on type. These were not inexperienced pilots. Between them they carried more than 26,000 hours of flight time. What confronted them as they descended toward Kai Tak was Typhoon Anita, sweeping through the region and dragging with it the invisible hazards that typhoons produce: violent wind shear, sudden downdrafts, walls of precipitation that confuse altimeters and mask visual references. In 1967, no technology existed to detect wind shear in real time. Crews flying into typhoon conditions could not know where the worst of it was lurking until they flew through it. That ignorance was systemic, not personal — but it did not protect them from what happened next.

The accident investigation concluded that the probable cause was pilot error: specifically, the crew's failure to notice that the aircraft had descended below the glide slope. Captain Thorsen did not monitor the approach adequately. The crew also did not follow Thai Airways' own procedures for a captain-monitored instrument approach in conditions of poor visibility. When the aircraft descended below its minimum safe altitude and the heading was abruptly corrected, the maneuver may have worsened the rate of descent. Downdrafts and wind shear from Typhoon Anita contributed additional downward force at the worst possible moment. The compounding of errors — procedural, perceptual, meteorological — left no margin. The Caravelle struck the water of Victoria Harbour short of the runway threshold. It did not reach Kai Tak.

Of the 80 people aboard, 56 survived. Twenty-four did not. Those 24 people — passengers and crew members whose names most histories do not record in detail — died in the water off one of the world's most recognizable airports, on a summer evening when a typhoon had turned an already difficult approach into an impossible one. The survivors were rescued from the harbour. In the years that followed, aviation safety organizations worked to develop better tools for detecting wind shear and to standardize crew coordination procedures during instrument approaches in adverse weather. The lessons that Flight 601 contributed to that work were real and eventually saved other lives. But that accounting cannot bring back the people who were on that Caravelle, or undo what the typhoon and a series of cascading failures cost them and their families.

Kai Tak Airport closed in 1998, replaced by the new Hong Kong International Airport on Lantau Island. The old site has been redeveloped — a cruise terminal now occupies part of the former runway — but the approaches that made Kai Tak both famous and fearsome live on in the memories of pilots who flew them and in the accident records that document what happened when things went wrong. Flight 601 was not the last accident at Kai Tak, but it belongs to a particular chapter: the era when typhoon-season approaches to one of the world's most constrained airports demanded everything a crew had, and occasionally demanded more. The harbour outside keeps no marker for what happened there on 30 June 1967. The water is simply water.