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用户719443"Regarding the 'shaft', as it is not explicitly mentioned in the provided references, its exact destination is unknown. However, if we analogize it to the concept of a time machine, the 'shaft' could potentially refer to a passage or structure within the time machine that guides or controls the flow of time travel. In such a context, the 'shaft' would likely lead to various points in time, whether it be the past or the future."