A 16-year-old boy has survived an extraordinary journey hidden in the wheel well of a five-hour flight from California to Hawaii, FBI officials say.

The boy is “lucky to be alive” and unharmed after flying for more than 5 hours in the plane’s wheel well, surviving cold temperatures at 38,000 feet and a lack of oxygen.

“Doesn’t even remember the flight,” FBI spokesman Tom Simon in Honolulu told The Associated Press on Sunday night.

“It’s amazing he survived that.”

The boy was questioned by the FBI after being discovered on the tarmac at the Maui airport Sunday morning with no identification, Tom Simon said.

“Kid’s lucky to be alive,” Tom Simon said.

A 16-year-old boy has survived an extraordinary journey hidden in the wheel well of a five-hour flight from California to Hawaii

The FBI spokesman said security footage from the San Jose airport verified that the boy from Santa Clara, California, hopped a fence to get to Hawaiian Airlines Flight 45 on Sunday morning. The child had run away from his family after an argument, Tom Simon said.

Tom Simon said when the Boeing 767 landed in Maui, the boy hopped down from the wheel well and started wandering around the airport grounds.

“He was unconscious for the lion’s share of the flight,” he said.

The flight lasted about 5½ hours.

Hawaiian Airlines spokeswoman Alison Croyle said airline personnel noticed the boy on the ramp after the flight arrived and immediately notified airport security.

“Our primary concern now is for the well-being of the boy, who is exceptionally lucky to have survived,” Alison Croyle said.

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Tom Simon said the boy was medically screened and found to be unharmed.

His misadventure immediately raised security questions. A Congressman who serves on the Homeland Security committee wondered how the teen could have snuck onto the airfield at San Jose unnoticed.

“I have long been concerned about security at our airport perimeters. #Stowaway teen demonstrates vulnerabilities that need to be addressed,” tweeted Rep. Eric Swalwell, a Democrat who represents the San Francisco Bay Area’s eastern cities and suburbs.

A Mineta San Jose International Airport spokeswoman said airport police were working with the FBI and the Transportation Security Agency to review security at the facility as part of an investigation.

“Our concern is with this young boy and his family. Thank God he survived and we hope his health is OK,” spokeswoman Rosemary Barnes said.

Officials at Kahului Airport referred questions to the State Department of Transportation, which did not return a phone call seeking comment. A Transportation Security Agency spokesman who declined to be named referred questions to the FBI and airport authorities.

The boy was released to child protective services and not charged with a crime, Tom Simon said.