| 1. | Huge underground cavities have opened in the north-western region of the town.
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| 2. | At the point of explosion, the nuclear fireball carves out an underground cavity.
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| 3. | There's also an underground cavity next to one of the public alleys ."
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| 4. | During the Cold War, scientists refined techniques for detecting underground cavities.
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| 5. | How quickly an underground cavity near the surface collapses is dependent on various factors.
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| 6. | But sophisticated electronic scanning gear has located two suspicious underground cavities that will be further investigated.
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| 7. | They probably make use of pre-existing underground cavities, as their legs do not show adaptations for digging.
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| 8. | "' Tunnel warfare "'is a general name for war being conducted in tunnels and other underground cavities.
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| 9. | While constructing the line in the 1970s, the tunnelers entered an underground cavity of the Neva River.
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| 10. | I remember reading about a concept to use nuclear bombs detonated in a deep underground cavity to generate power.
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