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| 81. | underground passage |
| 地下巷道 |
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| 82. | undergland shoot |
| 地下枝条 |
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| 83. | underground building |
| 地下建筑物 |
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| 84. | underground storage |
| 地下储存库 |
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| 85. | underground haulage |
| 地下运输 |
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| 86. | underground mill |
| 地下选矿厂 |
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| 87. | underground headquarter |
| 地下指挥所 |
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| 88. | underground railway line |
| 地下铁路线 |
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| 89. | underground laying |
| 地下敷设 |
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| 90. | underground storage system |
| 地下存储系统 |
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