CRITICAL DISASTER is a term used to describe a catastrophic event, such as a natural disaster or an act of terrorism. The term can also be used to refer to a situation in which a major problem has occurred and requires immediate attention. In this crossword, the solution for the term CRITICAL DISASTER is BOMB, which is a device that is designed to cause destruction and chaos. Bombs are often used in acts of terrorism and can cause massive destruction and loss of life.