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When you first have access to the camera you can not use any of the open stuff options.
So try to search more.
Of course it is possible you got bugged or something in that case reload an earlier save.....
Also some of those interactions are optional you can also kill the marines yourself in most cases but it is better to use the aliens and let them kill the commandos.
Then as you explore you find computer and once you hack them you can now use the option eg.opening vent.