WATCH: Rescuer pulls woman and dog from sinking car during floods in Louisiana

A state of emergency has been declared in the US state amid the severe flooding

WATCH: Rescuer pulls woman and dog from sinking car during floods in Louisiana

Screenshot: WAFB

Footage has captured the moment a rescuer pulled a woman from a sinking car during floods in the US, before disappearing back under the water to rescue her dog.

They were saved just in the nick of time after becoming trapped inside their car during historic floods in Baton Rouge, Louisiana, on Saturday.

The video, broadcast on WAFB, shows three men, who were on a boat, desperately trying to break into the car as it sinks into the water.

"Oh my God, I'm drowning," the woman is heard screaming, seconds before going silent as her vehicle becomes fully submerged.

With just moments left to save the pair, one of the rescuers, David Phung, jumps into the brown, murky water and disappears below the surface. 

He manages to drag the woman to safety through the ripped roof of her convertible as she begs him to go back for her dog.

He is seen taking a deep breath, before disappearing again, only to resurface moments later with the panic-stricken pet.

"I got the dog, I got the dog," he yells.

All three are understood to have survived the ordeal unhurt.

They are among thousands who have had to be rescued over the weekend after heavy rains swamped parts of southeast Louisiana

At least three people are understood to have been killed and one person is missing following what Louisiana governor John Bel Edwards has described as "unprecedented" and "historic" flooding.

He has declared a state of emergency, with at least 2,000 rescuers deployed across flood-hit areas.