Two men are under police guard in John Hunter Hospital after crashing a stolen car at Highfields early this morning.
They allegedly broke into a house in Ocean View Parade in Charlestown, before taking the keys to a grey Hyundai parked outside.
A short time later, they lost control of the car on City Road, slamming into a tree.
The 26 year old driver was trapped in the wreckage for some time.
He was eventually freed and taken to hospital suffering serious head injuries.
His 17 year old passenger fled the scene but was later tracked down in Glebe Road nursing a dislocated elbow.
Both are expected to be charged.