ChristmasJonesfan

Question: How did Bourne get out of Russia with a bullet wound and the Russian cops looking for him?

Answer: His elite training gave him the advantage over his pursuers and his skill, cunning and guile helped with his evasion of the authorities. Also, his extensive training in counter manoeuvres would have afforded him this such luxury. Remember Bourne was a professional.

ChristmasJonesfan

Question: If Marie was dead when Bourne took her body out of the car in the river, why did her body sink to the bottom instead of floating after being let go? And how did Jason make sure she was dead?

Answer: The density of the human body is similar to the density of water, and what keeps us floating is the air in our lungs. Once this air is replaced with water, people will sink to the bottom. Jason probably recognized that she drowned from his training. To add to the other answer from a scientific standpoint. Bodies do resurface once putrefaction begins. Microbes will start to eat bits from inside the body that results in a lot of gas. As a result, this causes the density of the body to decrease, as the gas is light, and the body will float up to the surface of the water.

Invader_Gir

Answer: We only see her sink to the bottom. We never see her surface. Also he checked her pulse before letting go. Just in a way we couldn't see. Her body would have surfaced eventually but by then we were more focused on Bourne and his escape.

ChristmasJonesfan