Trapped in car, nurse drowns.

Seatbelt fatality #6.

When police investigators arrived, they found Mr Hondo still in the car with his seatbelt on and the doors closed.
Dr Chapman said there were two possible reasons why Mr Hondo had not attempted to escape the car.
"He probably fell unconscious," he commented. "The water level was not very deep but had he been conscious, he might have made an attempt to get out and died from cold, rather than drowning.
"However he might also have been confused by being upside down in the cold and the darkness, while twice over the limit. It is hard for us, in a warm environment, to say how we would react."

Dr. Chapman goes to great pains to avoid giving a very legitimate possibility -- that the guy may have drowned because those extra moments spent fumbling for his seatbelt were a few moments too many.