The map will self-destruct if you do anything that you shouldn't do. If the map self-destructs, it becomes completely unplayable, and you will have to download the map again or load a backup if you want to try again. Here is the list of things that will self-destruct the map:
IMPORTANT: The download contains the map and the walkthrough. If you can't figure out what to do, watch the walkthrough. The walkthrough shows you how to beat the map.
By the way, the map is in hardcore mode.