Dream of swim

I dreamt that I'm driving my son somewhere and we end up on a lake bank a d I lose control of the car and drive into the lake, I manage to roll the windows down before the car sinks and someone swims out to us and helps my so. Get out of the car, then I get out and swim to the shore to watch the car completely sink. I feel terrified as I'm losing control of the car but remain really calm while figuring out to roll down the windows before the sinks