| 11. | The track then rises to the left and crosses over underground tunnel.
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| 12. | There is a cave with underground tunnels and a sparkling frozen lake.
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| 13. | The two facilities are connected to each other by an underground tunnel.
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| 14. | By its second season, the second and third underground tunnels were joined.
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| 15. | Gophers, which travel via underground tunnels, make a fan-shaped mound of dirt.
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| 16. | Two of the bombs dropped were bunker-busters, designed to penetrate underground tunnels.
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| 17. | So, probably there is an underground tunnel connecting the two forts.
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| 18. | Five days of filming were spent at the London Underground tunnels.
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| 19. | Surplus food is hoarded in an extensive system of underground tunnels.
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| 20. | Cheney was rushed to an underground tunnel leading to a shelter.
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