It happened on the A1 near Dunbar.
Tributes Paid To Glasgow Crash Pair
Family and friends of Kieran Lundie and Gemma McMonagle have been laying flowers and cards close to where they died.
21 year old driver Kieran and passenger Gemma - who was 24 - were pronounced dead at the scene of the crash in water running off the Forth and Clyde canal in the north of Glasgow.
Three other people were taken to hospital, one in a critical condition, following the single-vehicle collision in Balmore Road, Lambhill, at around 12.45am on Sunday.
Police Scotland said the blue Ford Focus was heading north near Skirsa Street when the car apparently went out of control.
It came off the road and struck a wall and railings before landing in the water near Lambhill Cemetery, officers said.
A 25-year-old woman and two men, aged 25 and 24, who were also passengers in the car, were taken by ambulance to the Queen Elizabeth University Hospital.
The woman is described as being in a critical condition, the 25-year-old man is stable, and the 24-year-old escaped serious injury but was treated for shock.
Tributes have been placed at the scene of the crash near with friends of the victims laying flowers by the water.
A Celtic strip covered with hand-written messages was tied to a fence at the scene of the crash.
Sergeant Nicola Taylor said: "Our inquires are continuing into the circumstances surrounding this tragic incident.
"It would appear that no other vehicle was involved and I would like to speak to anyone who either witnessed this crash or anyone who remembers seeing the vehicle travelling in Balmore Road just prior to the crash.''
Anyone with information is asked to contact the road policing team in Govan on 101.
A report is to be sent to the procurator fiscal.
The 26 year old was first targeted in Briarscroft Road.
Euan Johnston was shot in his car last month.
The family of three crash victims took their case for the 59-year-old to be put on trial to the Appeal Court in Edinburgh earlier this year.
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