Underground pit synonyms

What is another word for Underground pit?

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coal, mining, underground
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Synonyms for Underground pit. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/synonyms/underground_pit
Synonyms for Underground pit. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/synonyms/underground_pit>.
Synonyms for Underground pit. 2016. Accessed July 29, 2026. https://thesaurus.plus/synonyms/underground_pit.