On June 25, 1988, a 1988 Sadamisaki Peninsula CH-53 crash was involved in an aviation accident near Japan. No fatalities were officially recorded.
This incident is catalogued in the Wikidata aviation-safety dataset, which tracks more than three thousand documented aircraft accidents and aviation occurrences spanning the entire history of powered and unpowered flight. Cross-referencing records like this with primary investigative sources helps researchers analyse historical safety trends and identify recurring contributing factors across eras of aviation.