I need help on episode 4

I got up as far as "Ethics: Part 2" in the game where Nima, Jess, and her dad Gerry are in the underwater facility and they're diving into the water to use the pipes as cover. However after they dive into the water the game just stops, it doesn't continue onto the next part of the game which is the last three parts before the ending. How can I unlock the last three scenarios to continue on and finish the game?

I have the game for the Xbox 360
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