Supercedure cells and emergency cells appear for different reasons. The supercedure cell is created because the queen is not doing her job. The worker bees know how the hive needs to work and when the queen isn’t laying eggs, for example, they remove her from her position. This cell is placed vertically in the middle of the comb, not on the edge like swarm cells, in an effort to hide it from the queen the bees wish to replace. See “The other types of Queen Cells mean there could be trouble.“
