Cyber-bomb
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"Let the Earth see the effectiveness of Cyber technology. Explode the bomb."
Cyber-bombs are explosives used by the Cybermen.
The Cybermen attempted to destroy Earth in 2526 with a Cyber-bomb, but it was deactivated by the Doctor. (DW: Earthshock)
A group of Cybermen that was transported to the Death Zone on Gallifrey tried to use several bombs to destroy the Doctor's TARDIS. (DW: The Five Doctors)