Federal investigators are looking for more details regarding an incident when a United Airlines plane descended after takeoff from Hawaii to around 800 feet (250 meters) of the ocean’s surface.
According to United, the pilots are receiving further training.
Data from tracking service Flightradar24 shows that the Boeing 777 descended more than 1,400 feet (470 meters) before beginning to rise once more.
After that, the flight made its way to San Francisco. There were no reported injuries.
The event on December 18 just recently came to the public’s knowledge after a story in the aviation-industry newsletter The Air Current, according to a representative for the National Transportation Safety Board on Monday.
The United crew reportedly reported the event as part of a voluntary safety-reporting procedure, according to the agency that regulates airlines, the Federal Aviation Administration.
Without offering any additional information, the FAA stated that it reviewed the event “and took necessary action.”
United claimed that it collaborated on an inquiry with the FAA and the pilots’ union, which resulted in further training for the two pilots and is still ongoing.
The airline did not explain why the pilots decided against landing back at Kahului Airport on the island of Maui and continued the lengthy overwater journey to San Francisco.