The Sunshine Coast Forensic Crash Unit is investigating a serious single-vehicle traffic crash in Gympie overnight, October 4.
Just before 10pm, a red Mazda 121 was travelling on Neusavale Road in Wolvi when it left the road and crash into a tree.
The passenger of the vehicle, a 17-year-old Araluen boy, was airlifted to the Royal Brisbane and Women's Hospital with life-threatening-injuries.
The driver, a 17-year-old Gympie boy, was not injured.
Investigators are appealing to any witnesses, or anyone with relevant dashcam vision to come forward.
If you have information for police, contact Policelink by providing information using the online suspicious activity form 24hrs per day at www.police.qld.gov.au/reporting or call 131 444.
Report crime information anonymously via Crime Stoppers. Call 1800 333 000 or report online at www.crimestoppersqld.com.au.