'The water was gushing down like a waterfall and it was tons and tons of water.
'It looked like a burst dam and I think it must have been 15ft high right at the bottom of the dip.'
Officers said the pair drove into a flooded area on Queens Drive, between North Mossley Hill Road and Dovedale Road in Liverpool.
Police patrols assisted Merseyside Fire and Rescue Services at the scene in finding the man and woman. The next of kin of both have now been informed and formal identification has been made.
A file has been passed to the coroner who has asked Merseyside Police to further investigate the incident.
Those living around the area told the Liverpool Echo about how the road, which dips as it goes beneath a bridge, has long been a problem.
They said that multiple cars have been stuck in deep water in the last few months, which floods whenever there is torrential rain.
One man who lives on an adjacent road was walking his dog when the Echo attended the scene this morning. He spoke about the heavy rain last night that led to the flooding of the road.
He said: 'I've never seen it that bad. That's the deepest I've ever seen it.. It was absolutely lashing it down. Rarely have I seen it rain that bad. But nearly every time it rains they seem to have to close the road.
'The whole of Rose Lane was moving [because of the water] yesterday then to think somebody drove down there.'
He added: 'You could see the waves on it. I've never seen it that deep. Everybody was out last night. They had a drone over the top and you could hear the pumps. Neighbours said there was one or two ambulances.'
Another neighbour said: 'It floods every time you have torrential rain. In the last six months there have been at least two cars stuck. There is nothing leading it to warn people of the flooding.'
One woman at the scene this morning said the problem was 'supposed to have been fixed' and that flooding and cars getting stuck 'happens all the time...'
What a horrible tragedy, and like a lot of tragedies, it could have been prevented if the authorities had sorted out the problem when it first became dangerous.
It's the number one weather related way to die here in Texas. We have flash floods and it's very difficult to swim in one of those torrents..
Some people actually carry a knife that has a glass breaker to break their car windows.
A fire fighter buddy of mine pulled a dead young man from a car this spring.
He said the rough part was listening to the 911 operator pleading with him to kick out the windows or open the downstream side door where there's no pressure..
Instead the kid just freaked out and drowned in his car. The water went from about 18 inches to 6 feet in about 10 minutes..
It's the number one weather related way to die here in Texas. We have flash floods and it's very difficult to swim in one of those torrents..
Some people actually carry a knife that has a glass breaker to break their car windows.
A fire fighter buddy of mine pulled a dead young man from a car this spring.
He said the rough part was listening to the 911 operator pleading with him to kick out the windows or open the downstream side door where there's no pressure..
Instead the kid just freaked out and drowned in his car. The water went from about 18 inches to 6 feet in about 10 minutes..
We have the ResQme cutters and breaker in our car.