Anyone want to take a stab at debunking this "miracle"?

[FallentoReason]

If the door was opened then where is the large air bubbles that would have been released

The bubbles wouldn't have been released when the door was open. If air is still inside the car then you physically cannot open the door because the pressure is not balanced. This means the water pressure makes it humanly impossible to open the door then.

Water molecules would have seeped in just like the smell of sea salt (i.e. molecules) from the beach reaches your nose even when the windows are down (I'm not sure where you live but here in Australia that's what I observe). This is why I believe the car would have filled up with water. In saying that though, I did not see any bubbles, but I think it's unreasonable to say that the car was perfectly sealed because no car in my experience has been able to keep the smell of sea salt (or a fire i.e. the smoke from a bush fire) out of the car. Therefore the car must have filled up with water, whether we saw bubbles or not.

and if it were the back door it would have raised up and blocked him from reaching her, the guy in front of him would be the one who had access.

The car was perpendicular to the ground. Opening the back door i.e. the passenger door wouldn't block anyone as it would have opened to the side and downwards. I should have clarified I meant the passenger door and not the boot.

He said he reached through the window.

The water was murky so I'm not sure how he knows where he reached through. The gap of an open window and the gap of an open door feel the same; it's a gap, there's nothing there.