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On their course, Ash and Machin learn that the boffins have developed a powerful electromagnetic 'clockstopper' to counter the type 17's fuse. Ash gives in to Machin's pleadings, allowing him to finish disarming the type 17 discovered in a residential garden while Ash deals with a Category A bomb near a telephone exchange. In Ash's absence, the type 17 explodes, killing Machin, despite the clockstopper. Ash later finds the Category A bomb has ruptured without exploding, and has an intact type 17 fuse, which is also rigged with an anti-handling device called the Zeus 40 that detonates if there is an attempt to extract the fuse.