The NRP is looking for witnesses, after car hit a tree and entered the Welland Canal in St. Catharines.
Police were called out to the Glendale Ave and Welland Canals Parkway area, shortly after 2:00 a.m. this morning.
That portion of the canal had been drained weeks ago, so the car came to a stop in about 3 feet of water.
Officers say there were six people inside the car at the time.
A man in his 20's had to be taken to an out of town trauma centre with serious injuries.
The other passengers were treated for non-life threatening injuries in hospital.
The NRP says the suspected driver ran away on foot.
The vehicle sustained about $20,000 in damage.
Police say it was a blue Audi A4 Avant, with four doors in the 2009 model year.
Anyone with information regarding this incident should contact Niagara Regional Police by calling 905-688-4111 with extension 4233.
The investigation is ongoing.
Port Colborne Mulls Over Recycling Options
Councillor Concerned for Homeless in Winter
Beamsville Man Wins Lottery
Police Looking for Murder Suspect
NRP Recover Stolen Vehicles
Whales 'Holding Steady' at Marineland
Huge Donation Made to Hospital
School Bus Employee Charged by Police