The best scene from my favourite film, The Rock. In this scene the Navy Seals are caught trying to sabotage Hummel's operation. And it ends in massacre.
FAQ
Q: Why wouldn't Commander Anderson tell his unit to safety their weapons?
A: He is too loyal of a soldier and didn't want to look like a coward.
Q: What would Hummel have done if they had dropped their weapons?
A: Probably escorted them to the prison cells.
Q: What happened to make them start shooting?
A: The Captain of the mercenaries shoved a rock onto the floor and he knew that Anderson would use the distraction to start firing.