After the crew of a huge freight ship sailing from Tunesia to New York opens a container, they discover a group of terrorists.

You are just stating the inciting incident and the first plot point of your story.
What happens after they discover the terrorists? What is the goal of your protagonist, as dpg already pointed out above?

You need a lead character
Who (When this even you described happens) takes action and has a specific goal

Maybe it takes 2hrs to open the container and then that's it?