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Brian Ash is a young lieutenant who is assigned to a UXB unit in the early days of World War II. UXB (UneXploded Bomb) is the signal that an aerial bomb has not exploded. Ash's job is to deactivate German bombs, some of which have fuses specifically designed to kill him.
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Episode 1
Newly-promoted Second Lieutentant Brian Ash joins his new regiment only to find that they are assigned to bomb disposal in London. Ash is thrown in at the deep end when he and his men are sent to a bomb site.