Critical situation (6)
(Other definitions for crisis that I've seen before include "Time of intense difficulty or danger" , "Desperate situation" , "a difficult situation" , "Dilemma" , "Crucial point - decision time" .)
(Other definitions for emergency that I've seen before include "Serious casualty" , "Unexpected serious situation" , "Serious situation requiring immediate action" , "Serious situation needing prompt action" , "A sudden unforeseen crisis" .)