He 'kept/maintained his cool' [=he didn't get angry or upset] even though it was clear that he was being unfairly treated.
He was struggling to 'maintain his cool/composure'. [=he was struggling not to become angry or upset]
They barely had enough food to 'maintain life'. [=to make it possible for life to exist or continue]
(..) converging on the Pacific coast. As of now, it looks like Godzilla is still following the MUTO. He's hunting. Have our vessels maintain current distance from target. Plot the speed and heading of these things. I want to know exactly when and where they're going to make land. Yes, sir. (..)2014 Godzilla