Footage from inside the cockpit of a plane that crashed into a lagoon in September shows the plane approaching the water and the moment of the crash.

One person was killed when the Boeing 737 crashed into a lagoon in the Federated States of Micronesia. Other passengers and crew members were rescued.

In a cellphone video taken by an engineer in the cockpit and described in a report on the crash released Thursday, the plane's warning system says it is too close to the ground while a pilot exclaims, "We're too low!"

The video stops shortly after the plane hits the water. The report said it was "an invaluable source of vital information" for investigators.

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Terrifying footage from inside the cockpit of a Boeing 737 in the Federated States of Micronesia in September shows the plane heading toward the ground and the moment it crashes into a lagoon.

In the cellphone video, taken by an engineer sitting in the plane's jump seat and described in a report on the crash released Thursday, the pilots are seen using controls in the cockpit before the plane's warning system alerts them that it's too close to the ground.

"We're too low!" one pilot exclaims just before the plane hits the water. The video stops shortly after that.

You can see the footage here (the video has no sound):

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The plane, a Boeing 737 belonging to Air Niugini, Papua New Guinea's national airline, was flying from Pohnpei to Chuuk, both in the Federated States of Micronesia, when it crashed in the Chuuk Lagoon near Chuuk International Airport, killing one person.

Investigators said the plane missed the runway by 1,500 feet (460 meters) in weather with poor visibility that required pilots to rely on their instruments. The plane eventually sank in about 98 feet (30 meters) of water.

Thirty-four passengers and 12 crew members were rescued by local boats and US Navy divers, though six passengers were "seriously injured," according to the final report on the crash, from Papua New Guinea's Accident Investigation Commission.

The body of the passenger who died was found three days after the crash. The report said pathologists concluded that he had not been wearing a seat belt and had received blunt-force trauma to his head.

The report said the pilots did not respond to warnings that the plane was too close to the ground and did not follow landing checklists.

US Navy divers and local authorities rescuing passengers from an Air Niugini plane after it crashed near Chuuk International Airport in Micronesia. Lt. Zach Niezgodski /U.S. Navy/Handout via REUTERS/File Photo

It said the copilot, who was offering support and monitoring conditions, was "ineffective and was oblivious to the rapidly unfolding unsafe situation" and should have taken control of the plane.

Neither pilot was named in the report.

The report said the aircraft maintenance engineer in the jump seat took the video "for recreation purposes, using his smart phone." It said the video "predominantly showed the cockpit instruments," then "abruptly ended upon impact."

"The phone survived the accident and provided clear imagery of the cockpit environment and instruments," the report said, adding that it was "an invaluable source of vital information" for investigators.