| 1. | This mole lives in an underground tunnel system, which it constantly extends.
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| 2. | Nearby Goat Bluff was also the location of further underground tunnel systems.
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| 3. | His mother was a housekeeper working in a house with underground tunnels.
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| 4. | The temple was connected to the adjoining fort by an underground tunnel.
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| 5. | Sinbad knows that he must retrieve otherworldly crystals in an underground tunnel.
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| 6. | They infiltrate by boat, by airplane or through networks of underground tunnels.
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| 7. | The patients could move freely without having to travel through underground tunnels.
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| 8. | The basement has three underground tunnels connecting to the adjacent river bank.
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| 9. | Even now it is not certain where the chalk undergrounds tunnels end.
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| 10. | American troops moved through its underground tunnels to clear them of danger.
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