A submatrix collapse was a type of catastrophic failure that a Borg cube could suffer. When a cube experienced a submatrix collapse, the Borg Collective immediately severed its link to the afflicted population, considering it as good as dead. Drones remaining inside the cube may enter a state of regenestasis. (PIC: "Maps and Legends")
Spider-Man: No Way Home Trailer Dropped - The Loop
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