I believe Edmond died. Quick Google and I can’t see this interpretation . The final scene is being described as a flash forward having been rescued . There is no indication Edmund was rescued . I interpreted it as seeing Edmunds last thoughts as he died. The scene was filmed in brighter colours , and his breath misting on the window as he fell asleep in the police car indicated to me his last breath .
Surely there cannot be a different interpretation that means Edmond lived.