The tunnels were very small, only two feet square ( about 0.37 m ²), though larger chambers were dug to house the air pump, a workshop, and staging posts along each tunnel.

  • 这些隧道都很小,只有两英尺宽(约0.37平方米),不过也挖有大洞穴来容纳气泵,一个工场以及沿各个隧道而建的数个中途站。

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