The Double Event was predicted by K-Science officer, Hermann Gottlieb, who believed the increased number of Kaiju attacks suggested that the Breach that connected Earth to the Anteverse was stabilizing and would allow for more than one Kaiju to exit the Breach at once.
The "throat" of the Breach was becoming wider to accommodate the size of Kaiju classified as Category III and IV. The Double Event would be followed by a "Triple Event", with three Kaiju exiting the Breach at the same time. The latter would herald the predicted extinction level event that would wipe out humanity.
Hong Kong Incident
On January 8, 2025, the first Double Event occurred. Leatherback and Otachi, two Category IV Kaiju, emerged from the Breach and attacked the city of Hong Kong. When approaching the city, the Kaiju fought the Jaegers Cherno Alpha, Crimson Typhoon and Striker Eureka, and eventually overpowered all three. Gipsy Danger, who appeared later in the battle, was able to defeat both.
The proceeding "Triple Event" occurred during Operation Pitfall. Category IV and V Kaiju, Scunner, Raiju and Slattern, emerged from the Breach in response to the Pan Pacific Defense Corps's attempt to destroy it using a thermonuclear bomb strapped to the back of the Mark V Jaeger, Striker Eureka.